Reference:Movements: Difference between revisions

(3 intermediate revisions by the same user not shown)

Line 1,584:

|}

Produced from 1959 to 1965, Cal. 1565 is the early ref. 1675's "caller" GMT movement: its 24-hour hand remains linked to the main hour hand rather than independently adjustable. Rolex kept that layout until Cal. 3085. The 1565 introduced a free-sprung Breguet overcoil with Microstella regulation to this lineage, replacing the index used by earlier sport calibers. Rolex's [https://www.emmywatch.com/wp-content/plugins/watchsearch/inc/documents/rolex--1565--movement_parts.pdf Cal. 1565 parts sheet] describes an automatic calendar movement, shows "1560" engraved on its self-winding bridge, and lists part 7956, the date-indicator seating, for refs. 1500, 1501 and 1503. The [https://www.clubderelojeria.com/comunicaciones/R/ROLEX/rolex1575/ROLEX%201575.pdf Cal. 1575 parts catalogue] lists date-indicator parts for those same case references. The Vintage Rolex Field Manual also lists [[Reference:1500|ref. 1500]] in its Cal. 1565 Date table ([https://irp-cdn.multiscreensite.com/0b5fdf83/files/uploaded/1.0%20RolexBook-23Mar.pdf The Vintage Rolex Field Manual, caliber table]). These factory lists document service-parts applications; movement-level inspection determines the caliber fitted to a particular watch. Auction catalogues call ~~ref~~. 1501 Cal. 1560 or 1570, matching the bridge numbers shown in the 1565 and 1575 parts sheets. The records leave watch-specific fitment and changeover years unresolved. See [[Reference:1500|ref. 1500]], [[Reference:1501|ref. 1501]] ~~and~~ [[Reference:1503|ref. 1503]].

Produced from 1959 to 1965, Cal. 1565 is the early ref. 1675's "caller" GMT movement: its 24-hour hand remains linked to the main hour hand rather than independently adjustable. Rolex kept that layout until Cal. 3085. The 1565 introduced a free-sprung Breguet overcoil with Microstella regulation to this lineage, replacing the index used by earlier sport calibers. Rolex's [https://www.emmywatch.com/wp-content/plugins/watchsearch/inc/documents/rolex--1565--movement_parts.pdf Cal. 1565 parts sheet] describes an automatic calendar movement, shows "1560" engraved on its self-winding bridge, and lists part 7956, the date-indicator seating, for refs. 1500, 1501 and 1503. The [https://www.clubderelojeria.com/comunicaciones/R/ROLEX/rolex1575/ROLEX%201575.pdf Cal. 1575 parts catalogue] lists date-indicator parts for those same case references. The Vintage Rolex Field Manual also lists [[Reference:1500|ref. 1500]] in its Cal. 1565 Date table ([https://irp-cdn.multiscreensite.com/0b5fdf83/files/uploaded/1.0%20RolexBook-23Mar.pdf The Vintage Rolex Field Manual, caliber table]). These factory lists document service-parts applications; movement-level inspection determines the caliber fitted to a particular watch. Auction catalogues call refs. 1501 and 1507 Cal. 1560 or 1570, matching the bridge numbers shown in the 1565 and 1575 parts sheets. For the 1507, the auction examples include joint 1503/1507 attributions; no movement photograph confirms the exact caliber. The records leave watch-specific fitment and changeover years unresolved. See [[Reference:1500|ref. 1500]], [[Reference:1501|ref. 1501]], [[Reference:1503|ref. 1503]] and [[Reference:1507|ref. 1507]].

Line 1,618:

|}

Cal. 1570 is the 19,800-vph revision of the 1560, introduced in 1965. Christie’s identifies Cal. 1570 in ref. 1011 case 692498, dated circa 1962; its lot chronology overlaps the ref. 1011 Cal. 1560 examples and does not establish a changeover. See [[Reference:1011|ref. 1011]]. Monaco Legend lists Cal. 1570 in a 1966 pink-gold 1013, Gazette Drouot in a circa-1968 example and Rago in a 1978 example. The 1013 records document both calibers but leave their changeover unresolved. See [[Reference:1013|ref. 1013]]. One Artcurial ref. 1005 lot is catalogued with Cal. 1550, despite a chronometer-dial description; other 1005 catalogues list 1560 or 1570. This single lot does not establish a 1005 movement variant or resolve whether the movement is original. It retains the free-sprung Breguet overcoil and Microstella regulation, with adjustment to temperature and five positions. Family-wide bridge engraving causes date movements such as the 1575 in a ref. 1665 to appear marked 1570; the engraving alone does not identify the exact caliber. Phillips identifies Cal. 1570 in a circa-1985 ref. 1024, while Dorotheum lists it on a circa-1965/70 example; those ref. 1024 dates overlap its Cal. 1560 records. Christie’s, Antiquorum, Phillips, Dorotheum and Bonhams also catalogue Cal. 1570 in ref. 1501 examples; see [[Reference:1501|ref. 1501]]. These lot labels do not establish a 1501 changeover year. Heritage (circa 1960; its case serial conflicts with the chart date), Christie's (circa 1969 and 1977), Sotheby's (circa 1977 and 1978), and Cambi (circa 1971, with a disputed all-steel attribution) identify Cal. 1570 in individual ref. 1505 watches. These lot descriptions document reported fitment, not a reference-wide caliber rule or changeover. See [[Reference:1505|ref. 1505]]. [https://jewelry.ha.com/itm/timepieces/wristwatch/rolex-ref-1505-early-two-tone-oyster-perpetual-date-circa-1960/a/5563-54188.s Heritage]; [https://www.christies.com/en/lot/lot-5257457 Christie's]; [https://onlineonly.christies.com/s/christies-watches-online/rolex-two-tone-date-ref-1505-227/67553 Christie's]; [https://www.sothebys.com/en/buy/auction/2024/fine-watches/date-reference-1505-montre-bracelet-en-acier-et-or Sotheby's]; [https://www.sothebys.com/en/buy/auction/2023/fine-watches-2/reference-1505-oyster-perpetual-date-a-yellow-gold Sotheby's]; [https://www.cambiaste.com/uploads/auctions/1081-cambi_orologi_999_2024_12_eb.pdf Cambi].

Cal. 1570 is the 19,800-vph revision of the 1560, introduced in 1965. Christie’s identifies Cal. 1570 in ref. 1011 case 692498, dated circa 1962; its lot chronology overlaps the ref. 1011 Cal. 1560 examples and does not establish a changeover. See [[Reference:1011|ref. 1011]]. Monaco Legend lists Cal. 1570 in a 1966 pink-gold 1013, Gazette Drouot in a circa-1968 example and Rago in a 1978 example. The 1013 records document both calibers but leave their changeover unresolved. See [[Reference:1013|ref. 1013]]. One Artcurial ref. 1005 lot is catalogued with Cal. 1550, despite a chronometer-dial description; other 1005 catalogues list 1560 or 1570. This single lot does not establish a 1005 movement variant or resolve whether the movement is original. It retains the free-sprung Breguet overcoil and Microstella regulation, with adjustment to temperature and five positions. Family-wide bridge engraving causes date movements such as the 1575 in a ref. 1665 to appear marked 1570; the engraving alone does not identify the exact caliber. Phillips identifies Cal. 1570 in a circa-1985 ref. 1024, while Dorotheum lists it on a circa-1965/70 example; those ref. 1024 dates overlap its Cal. 1560 records. Christie’s, Antiquorum, Phillips, Dorotheum and Bonhams also catalogue Cal. 1570 in ref. 1501 examples; see [[Reference:1501|ref. 1501]]. These lot labels do not establish a 1501 changeover year. Heritage (circa 1960; its case serial conflicts with the chart date), Christie's (circa 1969 and 1977), Sotheby's (circa 1977 and 1978), and Cambi (circa 1971, with a disputed all-steel attribution) identify Cal. 1570 in individual ref. 1505 watches. These lot descriptions document reported fitment, not a reference-wide caliber rule or changeover. See [[Reference:1505|ref. 1505]]. [https://jewelry.ha.com/itm/timepieces/wristwatch/rolex-ref-1505-early-two-tone-oyster-perpetual-date-circa-1960/a/5563-54188.s Heritage]; [https://www.christies.com/en/lot/lot-5257457 Christie's]; [https://onlineonly.christies.com/s/christies-watches-online/rolex-two-tone-date-ref-1505-227/67553 Christie's]; [https://www.sothebys.com/en/buy/auction/2024/fine-watches/date-reference-1505-montre-bracelet-en-acier-et-or Sotheby's]; [https://www.sothebys.com/en/buy/auction/2023/fine-watches-2/reference-1505-oyster-perpetual-date-a-yellow-gold Sotheby's]; [https://www.cambiaste.com/uploads/auctions/1081-cambi_orologi_999_2024_12_eb.pdf Cambi]. Phillips identifies Cal. 1570 in the white-gold ref. [[Reference:1504|1504]] sold in 2016; Eguchi lists the caliber, and the photographed W3674 example shows the same bridge marking in a yellow-gold watch. These records document individual watches, not a caliber changeover. [https://www.dist.phillips.com/content/web/auctions/HK080216/HK080216_zh_1.pdf Phillips, lot 1068] [https://eguchi-store.jp/stocklist/287626/ Eguchi, item 287626] [https://bulangandsons.de/products/rolex-oyster-perpetual-date-grey-brick-dial-moreau-finish-with-brick-bracelet-ref-1504-in-18-k-yellow-gold-w3674 W3674 item listing].

Waddington’s lists Cal. 1570 in ref. 1023/8B and dates it circa 1964. That estimate predates the 1965 start date used here for Cal. 1570; Pergola’s unofficial chart places serial 902827 in 1962. Hess and Watch.de identify Cal. 1570 on other 1023 listings, and a 2022 Rolex Forums photograph shows a rotor marked 1570 inside an outer case stamped 1023. Kaplans also lists Cal. 1570 for serial 2,186,841; Watch.de masks its serial as 2186xxx, and their other matching details suggest a repeat listing. These records document the caliber on individual watches, but they do not establish first fitment or a changeover; see [[Reference:1023|1023]].

Line 1,661:

Rolex engraved the 1575 bridge "1570," so that marking on a ref. 1680 or 1675 identifies the caliber family. Factory parts records distinguish 1565G, 1575, 1575G and 1575GMT. Date and GMT versions are separately catalogued builds, and the GMT parts also circulated as a conversion set for a standard 1560 or 1570.

The 1575 shares factory balance assembly 8106 with the 1570 and related family members. It has shock protection on the escape wheel on both dial and movement sides, as well as on the balance. The Vintage Rolex Field Manual lists [[Reference:1500|ref. 1500]] as a Date fitment in its Cal. 1575 table ([https://irp-cdn.multiscreensite.com/0b5fdf83/files/uploaded/1.0%20RolexBook-23Mar.pdf The Vintage Rolex Field Manual, caliber table]); a [https://www.clubderelojeria.com/comunicaciones/R/ROLEX/rolex1575/ROLEX%201575.pdf Rolex Cal. 1575 parts catalogue] lists date-indicator parts for refs. 1500, 1501 and 1503. Auction catalogues more often describe 1500 examples as Cal. 1570. [https://www.bobswatches.com/rolex-blog/watch-review/vintage-week-rolex-oyster-perpetual-chronometer-date-ref-1500.html Bob’s Watches] explains the 1570 bridge engraving on date-equipped 1575-family movements; the engraving alone does not establish the caliber beneath it. The available records do not identify a watch-specific changeover. Other documented fitments include the Submariner 1680, GMT-Master 1675 from about the 1.4-million serial range, Explorer II 1655 and Sea-Dweller 1665.

The 1575 shares factory balance assembly 8106 with the 1570 and related family members. It has shock protection on the escape wheel on both dial and movement sides, as well as on the balance. The Vintage Rolex Field Manual lists [[Reference:1500|ref. 1500]] as a Date fitment in its Cal. 1575 table ([https://irp-cdn.multiscreensite.com/0b5fdf83/files/uploaded/1.0%20RolexBook-23Mar.pdf The Vintage Rolex Field Manual, caliber table]); a [https://www.clubderelojeria.com/comunicaciones/R/ROLEX/rolex1575/ROLEX%201575.pdf Rolex Cal. 1575 parts catalogue] lists date-indicator parts for refs. 1500, 1501 and 1503. Auction catalogues more often describe 1500 examples as Cal. 1570. [https://www.bobswatches.com/rolex-blog/watch-review/vintage-week-rolex-oyster-perpetual-chronometer-date-ref-1500.html Bob’s Watches] explains the 1570 bridge engraving on date-equipped 1575-family movements; the engraving alone does not establish the caliber beneath it. The available records do not identify a watch-specific changeover. For ref. [[Reference:1506|1506]], two auction catalogues identify Cal. 1570; one seller lists 1575 although its movement photograph shows a 1570-marked bridge. The inner caseback in that photograph is stamped 1503. These are object-level records and do not establish a caliber sequence for the reference. Other documented fitments include the Submariner 1680, GMT-Master 1675 from about the 1.4-million serial range, Explorer II 1655 and Sea-Dweller 1665.

@@ Line 1,584: / Line 1,584: @@
 |}
-Produced from 1959 to 1965, Cal. 1565 is the early ref. 1675's "caller" GMT movement: its 24-hour hand remains linked to the main hour hand rather than independently adjustable. Rolex kept that layout until Cal. 3085. The 1565 introduced a free-sprung Breguet overcoil with Microstella regulation to this lineage, replacing the index used by earlier sport calibers. Rolex's [https://www.emmywatch.com/wp-content/plugins/watchsearch/inc/documents/rolex--1565--movement_parts.pdf Cal. 1565 parts sheet] describes an automatic calendar movement, shows "1560" engraved on its self-winding bridge, and lists part 7956, the date-indicator seating, for refs. 1500, 1501 and 1503. The [https://www.clubderelojeria.com/comunicaciones/R/ROLEX/rolex1575/ROLEX%201575.pdf Cal. 1575 parts catalogue] lists date-indicator parts for those same case references. The Vintage Rolex Field Manual also lists [[Reference:1500|ref. 1500]] in its Cal. 1565 Date table ([https://irp-cdn.multiscreensite.com/0b5fdf83/files/uploaded/1.0%20RolexBook-23Mar.pdf The Vintage Rolex Field Manual, caliber table]). These factory lists document service-parts applications; movement-level inspection determines the caliber fitted to a particular watch. Auction catalogues call ref. 1501 Cal. 1560 or 1570, matching the bridge numbers shown in the 1565 and 1575 parts sheets. The records leave watch-specific fitment and changeover years unresolved. See [[Reference:1500|ref. 1500]], [[Reference:1501|ref. 1501]] and [[Reference:1503|ref. 1503]].
+Produced from 1959 to 1965, Cal. 1565 is the early ref. 1675's "caller" GMT movement: its 24-hour hand remains linked to the main hour hand rather than independently adjustable. Rolex kept that layout until Cal. 3085. The 1565 introduced a free-sprung Breguet overcoil with Microstella regulation to this lineage, replacing the index used by earlier sport calibers. Rolex's [https://www.emmywatch.com/wp-content/plugins/watchsearch/inc/documents/rolex--1565--movement_parts.pdf Cal. 1565 parts sheet] describes an automatic calendar movement, shows "1560" engraved on its self-winding bridge, and lists part 7956, the date-indicator seating, for refs. 1500, 1501 and 1503. The [https://www.clubderelojeria.com/comunicaciones/R/ROLEX/rolex1575/ROLEX%201575.pdf Cal. 1575 parts catalogue] lists date-indicator parts for those same case references. The Vintage Rolex Field Manual also lists [[Reference:1500|ref. 1500]] in its Cal. 1565 Date table ([https://irp-cdn.multiscreensite.com/0b5fdf83/files/uploaded/1.0%20RolexBook-23Mar.pdf The Vintage Rolex Field Manual, caliber table]). These factory lists document service-parts applications; movement-level inspection determines the caliber fitted to a particular watch. Auction catalogues call refs. 1501 and 1507 Cal. 1560 or 1570, matching the bridge numbers shown in the 1565 and 1575 parts sheets. For the 1507, the auction examples include joint 1503/1507 attributions; no movement photograph confirms the exact caliber. The records leave watch-specific fitment and changeover years unresolved. See [[Reference:1500|ref. 1500]], [[Reference:1501|ref. 1501]], [[Reference:1503|ref. 1503]] and [[Reference:1507|ref. 1507]].
 <span id="cal-1570"></span>
@@ Line 1,618: / Line 1,618: @@
 |}
-Cal. 1570 is the 19,800-vph revision of the 1560, introduced in 1965. Christie’s identifies Cal. 1570 in ref. 1011 case 692498, dated circa 1962; its lot chronology overlaps the ref. 1011 Cal. 1560 examples and does not establish a changeover. See [[Reference:1011|ref. 1011]]. Monaco Legend lists Cal. 1570 in a 1966 pink-gold 1013, Gazette Drouot in a circa-1968 example and Rago in a 1978 example. The 1013 records document both calibers but leave their changeover unresolved. See [[Reference:1013|ref. 1013]]. One Artcurial ref. 1005 lot is catalogued with Cal. 1550, despite a chronometer-dial description; other 1005 catalogues list 1560 or 1570. This single lot does not establish a 1005 movement variant or resolve whether the movement is original. It retains the free-sprung Breguet overcoil and Microstella regulation, with adjustment to temperature and five positions. Family-wide bridge engraving causes date movements such as the 1575 in a ref. 1665 to appear marked 1570; the engraving alone does not identify the exact caliber. Phillips identifies Cal. 1570 in a circa-1985 ref. 1024, while Dorotheum lists it on a circa-1965/70 example; those ref. 1024 dates overlap its Cal. 1560 records. Christie’s, Antiquorum, Phillips, Dorotheum and Bonhams also catalogue Cal. 1570 in ref. 1501 examples; see [[Reference:1501|ref. 1501]]. These lot labels do not establish a 1501 changeover year. Heritage (circa 1960; its case serial conflicts with the chart date), Christie's (circa 1969 and 1977), Sotheby's (circa 1977 and 1978), and Cambi (circa 1971, with a disputed all-steel attribution) identify Cal. 1570 in individual ref. 1505 watches. These lot descriptions document reported fitment, not a reference-wide caliber rule or changeover. See [[Reference:1505|ref. 1505]]. [https://jewelry.ha.com/itm/timepieces/wristwatch/rolex-ref-1505-early-two-tone-oyster-perpetual-date-circa-1960/a/5563-54188.s Heritage]; [https://www.christies.com/en/lot/lot-5257457 Christie's]; [https://onlineonly.christies.com/s/christies-watches-online/rolex-two-tone-date-ref-1505-227/67553 Christie's]; [https://www.sothebys.com/en/buy/auction/2024/fine-watches/date-reference-1505-montre-bracelet-en-acier-et-or Sotheby's]; [https://www.sothebys.com/en/buy/auction/2023/fine-watches-2/reference-1505-oyster-perpetual-date-a-yellow-gold Sotheby's]; [https://www.cambiaste.com/uploads/auctions/1081-cambi_orologi_999_2024_12_eb.pdf Cambi].
+Cal. 1570 is the 19,800-vph revision of the 1560, introduced in 1965. Christie’s identifies Cal. 1570 in ref. 1011 case 692498, dated circa 1962; its lot chronology overlaps the ref. 1011 Cal. 1560 examples and does not establish a changeover. See [[Reference:1011|ref. 1011]]. Monaco Legend lists Cal. 1570 in a 1966 pink-gold 1013, Gazette Drouot in a circa-1968 example and Rago in a 1978 example. The 1013 records document both calibers but leave their changeover unresolved. See [[Reference:1013|ref. 1013]]. One Artcurial ref. 1005 lot is catalogued with Cal. 1550, despite a chronometer-dial description; other 1005 catalogues list 1560 or 1570. This single lot does not establish a 1005 movement variant or resolve whether the movement is original. It retains the free-sprung Breguet overcoil and Microstella regulation, with adjustment to temperature and five positions. Family-wide bridge engraving causes date movements such as the 1575 in a ref. 1665 to appear marked 1570; the engraving alone does not identify the exact caliber. Phillips identifies Cal. 1570 in a circa-1985 ref. 1024, while Dorotheum lists it on a circa-1965/70 example; those ref. 1024 dates overlap its Cal. 1560 records. Christie’s, Antiquorum, Phillips, Dorotheum and Bonhams also catalogue Cal. 1570 in ref. 1501 examples; see [[Reference:1501|ref. 1501]]. These lot labels do not establish a 1501 changeover year. Heritage (circa 1960; its case serial conflicts with the chart date), Christie's (circa 1969 and 1977), Sotheby's (circa 1977 and 1978), and Cambi (circa 1971, with a disputed all-steel attribution) identify Cal. 1570 in individual ref. 1505 watches. These lot descriptions document reported fitment, not a reference-wide caliber rule or changeover. See [[Reference:1505|ref. 1505]]. [https://jewelry.ha.com/itm/timepieces/wristwatch/rolex-ref-1505-early-two-tone-oyster-perpetual-date-circa-1960/a/5563-54188.s Heritage]; [https://www.christies.com/en/lot/lot-5257457 Christie's]; [https://onlineonly.christies.com/s/christies-watches-online/rolex-two-tone-date-ref-1505-227/67553 Christie's]; [https://www.sothebys.com/en/buy/auction/2024/fine-watches/date-reference-1505-montre-bracelet-en-acier-et-or Sotheby's]; [https://www.sothebys.com/en/buy/auction/2023/fine-watches-2/reference-1505-oyster-perpetual-date-a-yellow-gold Sotheby's]; [https://www.cambiaste.com/uploads/auctions/1081-cambi_orologi_999_2024_12_eb.pdf Cambi]. Phillips identifies Cal. 1570 in the white-gold ref. [[Reference:1504|1504]] sold in 2016; Eguchi lists the caliber, and the photographed W3674 example shows the same bridge marking in a yellow-gold watch. These records document individual watches, not a caliber changeover. [https://www.dist.phillips.com/content/web/auctions/HK080216/HK080216_zh_1.pdf Phillips, lot 1068] [https://eguchi-store.jp/stocklist/287626/ Eguchi, item 287626] [https://bulangandsons.de/products/rolex-oyster-perpetual-date-grey-brick-dial-moreau-finish-with-brick-bracelet-ref-1504-in-18-k-yellow-gold-w3674 W3674 item listing].
 Waddington’s lists Cal. 1570 in ref. 1023/8B and dates it circa 1964. That estimate predates the 1965 start date used here for Cal. 1570; Pergola’s unofficial chart places serial 902827 in 1962. Hess and Watch.de identify Cal. 1570 on other 1023 listings, and a 2022 Rolex Forums photograph shows a rotor marked 1570 inside an outer case stamped 1023. Kaplans also lists Cal. 1570 for serial 2,186,841; Watch.de masks its serial as 2186xxx, and their other matching details suggest a repeat listing. These records document the caliber on individual watches, but they do not establish first fitment or a changeover; see [[Reference:1023|1023]].
@@ Line 1,661: / Line 1,661: @@
 Rolex engraved the 1575 bridge "1570," so that marking on a ref. 1680 or 1675 identifies the caliber family. Factory parts records distinguish 1565G, 1575, 1575G and 1575GMT. Date and GMT versions are separately catalogued builds, and the GMT parts also circulated as a conversion set for a standard 1560 or 1570.
-The 1575 shares factory balance assembly 8106 with the 1570 and related family members. It has shock protection on the escape wheel on both dial and movement sides, as well as on the balance. The Vintage Rolex Field Manual lists [[Reference:1500|ref. 1500]] as a Date fitment in its Cal. 1575 table ([https://irp-cdn.multiscreensite.com/0b5fdf83/files/uploaded/1.0%20RolexBook-23Mar.pdf The Vintage Rolex Field Manual, caliber table]); a [https://www.clubderelojeria.com/comunicaciones/R/ROLEX/rolex1575/ROLEX%201575.pdf Rolex Cal. 1575 parts catalogue] lists date-indicator parts for refs. 1500, 1501 and 1503. Auction catalogues more often describe 1500 examples as Cal. 1570. [https://www.bobswatches.com/rolex-blog/watch-review/vintage-week-rolex-oyster-perpetual-chronometer-date-ref-1500.html Bob’s Watches] explains the 1570 bridge engraving on date-equipped 1575-family movements; the engraving alone does not establish the caliber beneath it. The available records do not identify a watch-specific changeover. Other documented fitments include the Submariner 1680, GMT-Master 1675 from about the 1.4-million serial range, Explorer II 1655 and Sea-Dweller 1665.
+The 1575 shares factory balance assembly 8106 with the 1570 and related family members. It has shock protection on the escape wheel on both dial and movement sides, as well as on the balance. The Vintage Rolex Field Manual lists [[Reference:1500|ref. 1500]] as a Date fitment in its Cal. 1575 table ([https://irp-cdn.multiscreensite.com/0b5fdf83/files/uploaded/1.0%20RolexBook-23Mar.pdf The Vintage Rolex Field Manual, caliber table]); a [https://www.clubderelojeria.com/comunicaciones/R/ROLEX/rolex1575/ROLEX%201575.pdf Rolex Cal. 1575 parts catalogue] lists date-indicator parts for refs. 1500, 1501 and 1503. Auction catalogues more often describe 1500 examples as Cal. 1570. [https://www.bobswatches.com/rolex-blog/watch-review/vintage-week-rolex-oyster-perpetual-chronometer-date-ref-1500.html Bob’s Watches] explains the 1570 bridge engraving on date-equipped 1575-family movements; the engraving alone does not establish the caliber beneath it. The available records do not identify a watch-specific changeover. For ref. [[Reference:1506|1506]], two auction catalogues identify Cal. 1570; one seller lists 1575 although its movement photograph shows a 1570-marked bridge. The inner caseback in that photograph is stamped 1503. These are object-level records and do not establish a caliber sequence for the reference. Other documented fitments include the Submariner 1680, GMT-Master 1675 from about the 1.4-million serial range, Explorer II 1655 and Sea-Dweller 1665.
 <span id="gmt-branch"></span>