Reference:2940: Difference between revisions

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|-

| movement

| Cal. ~~9¾'''~~, 17 jewels (some 18j); some examples Cal. 630

| Cal. 9¾′′′, 17 jewels (some 18j); some examples Cal. 630

|-

| case materials

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The 2940 is the volume wartime Bubbleback. The 3131 and its sweep-seconds twin 3132 had proven in 1936 that the two-piece Oyster could be manufactured at scale; the 2940 is the reference that made the same case architecture available in steel and inexpensive gold cap. It carries the sweep-seconds configuration that the 3132 pioneered, a center-mounted seconds hand running off Cal. ~~9¾'''~~ rather than a subsidiary register at 6, and pairs it with a case sized for a masculine wartime wrist. Production runs from roughly 1940 through 1949, with the concentrated peak falling in the five years from 1942 through 1947.

The 2940 is the volume wartime Bubbleback. The 3131 and its sweep-seconds twin 3132 had proven in 1936 that the two-piece Oyster could be manufactured at scale; the 2940 is the reference that made the same case architecture available in steel and inexpensive gold cap. It carries the sweep-seconds configuration that the 3132 pioneered, a center-mounted seconds hand running off Cal. 9¾′′′ rather than a subsidiary register at 6, and pairs it with a case sized for a masculine wartime wrist. Production runs from roughly 1940 through 1949, with the concentrated peak falling in the five years from 1942 through 1947.

Within the Bubbleback range, the 2940 sits beside the sub-seconds 2764, the more mixed-metal 3065, and the engine-turned 3372. Steel examples are the standard configuration. 14K gold-top over steel sits above them, and solid 9K gold is the scarcest material. The documented serial range runs from the low 200,000s to the high 600,000s, which fits roughly 1942 to 1949. Unlike later sports references, the 2940 does not break into neat generations. The variation is in dials, hands, and case metal.

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The 2940's movement is non-hacking. Pulling the crown to the setting position stops the hands from advancing but the seconds continue to sweep; setting to the exact second requires a fractional backlash adjustment that is second nature on contemporary vintage Rolex but foreign to any Rolex made after the introduction of hacking seconds in the 1970s.

Cal. 630 is cited on some 2940 examples and is the formal numbered caliber for the ~~9¾'''~~ sweep-seconds configuration. The two designations refer to the same movement family under different naming conventions. The ligne measurement (~~9¾'''~~) is older, and the numbered caliber (630) is the catalog reference Rolex used in service documentation. A 2940 described with Cal. ~~9¾'''~~ and a 2940 described with Cal. 630 are, in practice, the same watch.

Cal. 630 is cited on some 2940 examples and is the formal numbered caliber for the 9¾′′′ sweep-seconds configuration. The two designations refer to the same movement family under different naming conventions. The ligne measurement (9¾′′′) is older, and the numbered caliber (630) is the catalog reference Rolex used in service documentation. A 2940 described with Cal. 9¾′′′ and a 2940 described with Cal. 630 are, in practice, the same watch.

@@ Line 62: / Line 62: @@
 |-
 | movement
-| Cal. 9¾''', 17 jewels (some 18j); some examples Cal. 630
+| Cal. 9¾′′′, 17 jewels (some 18j); some examples Cal. 630
 |-
 | case materials
@@ Line 75: / Line 75: @@
 [[File:Ref 2940 full.webp|thumb|right|250px|alt=2940 rose-numeral dial Phillips lot|Phillips Geneva 2015 lot, rose-numeral dial]]
-The 2940 is the volume wartime Bubbleback. The 3131 and its sweep-seconds twin 3132 had proven in 1936 that the two-piece Oyster could be manufactured at scale; the 2940 is the reference that made the same case architecture available in steel and inexpensive gold cap. It carries the sweep-seconds configuration that the 3132 pioneered, a center-mounted seconds hand running off Cal. 9¾''' rather than a subsidiary register at 6, and pairs it with a case sized for a masculine wartime wrist. Production runs from roughly 1940 through 1949, with the concentrated peak falling in the five years from 1942 through 1947.
+The 2940 is the volume wartime Bubbleback. The 3131 and its sweep-seconds twin 3132 had proven in 1936 that the two-piece Oyster could be manufactured at scale; the 2940 is the reference that made the same case architecture available in steel and inexpensive gold cap. It carries the sweep-seconds configuration that the 3132 pioneered, a center-mounted seconds hand running off Cal. 9¾′′′ rather than a subsidiary register at 6, and pairs it with a case sized for a masculine wartime wrist. Production runs from roughly 1940 through 1949, with the concentrated peak falling in the five years from 1942 through 1947.
 Within the Bubbleback range, the 2940 sits beside the sub-seconds 2764, the more mixed-metal 3065, and the engine-turned 3372. Steel examples are the standard configuration. 14K gold-top over steel sits above them, and solid 9K gold is the scarcest material. The documented serial range runs from the low 200,000s to the high 600,000s, which fits roughly 1942 to 1949. Unlike later sports references, the 2940 does not break into neat generations. The variation is in dials, hands, and case metal.
@@ Line 111: / Line 111: @@
 The 2940's movement is non-hacking. Pulling the crown to the setting position stops the hands from advancing but the seconds continue to sweep; setting to the exact second requires a fractional backlash adjustment that is second nature on contemporary vintage Rolex but foreign to any Rolex made after the introduction of hacking seconds in the 1970s.
-Cal. 630 is cited on some 2940 examples and is the formal numbered caliber for the 9¾''' sweep-seconds configuration. The two designations refer to the same movement family under different naming conventions. The ligne measurement (9¾''') is older, and the numbered caliber (630) is the catalog reference Rolex used in service documentation. A 2940 described with Cal. 9¾''' and a 2940 described with Cal. 630 are, in practice, the same watch.
+Cal. 630 is cited on some 2940 examples and is the formal numbered caliber for the 9¾′′′ sweep-seconds configuration. The two designations refer to the same movement family under different naming conventions. The ligne measurement (9¾′′′) is older, and the numbered caliber (630) is the catalog reference Rolex used in service documentation. A 2940 described with Cal. 9¾′′′ and a 2940 described with Cal. 630 are, in practice, the same watch.
 <span id="dial-variants"></span>