Rolex Oyster Perpetual Tru-Beat 6556

The Oyster Perpetual Tru-Beat 6556 uses a mechanical seconds hand that stops at each marker and jumps forward once per second. Rolex paired that dead-beat display with automatic Cal. 1040. Auction houses date the model’s introduction to 1954; surviving records show steel and 18K gold cases, while the exact production end and dial range remain unsettled.

Core facts

detail	value
reference	6556
model name	Oyster Perpetual Tru-Beat
family	Oyster Perpetual, time-only
launch	1954, as reported by Christie's and Phillips
observed examples	auction-dated 1955–1962; production span unconfirmed
movement	automatic Cal. 1040; the examined catalogues list 26 jewels
case	screw-back Oyster case; steel and 18K gold examples
diameter	34–35 mm in cited catalogues
crystal	acrylic, as catalogued on individual examples
display	hours, minutes, dead-beat centre seconds; no date

Where it sits in the line

The 6556 is a time-only Oyster Perpetual with dead-beat seconds. Cal. 1040 adds the mechanism that advances the seconds hand once per second to the Cal. 1030 architecture. Christie's calls it a modified 1030; watchmaker Aaron Berlow’s restoration account identifies a longer second intermediate wheel unique to the 1040. A continuously sweeping seconds hand on a 6556 warrants inspection of the movement and service history.

Auction essays describe the ticking seconds as useful for counting a pulse. Phillips documents one watch with medals and a letter connecting it to Rolex watchmaker John Barnes and medical worker Daisy Cox. That is a clinical provenance story for one watch; the sources reviewed here leave the reference’s broader intended market unclear.

Production outline

Christie's and Phillips give 1954 as the launch year. The cited records include examples dated 1955 and 1956, plus steel and yellow-gold watches catalogued circa 1961 and 1962. Phillips and Christie's repeat a 1959 end date, while the later case-numbered examples extend the documented record. Auction dating can be imprecise, so the production cutoff remains uncertain.

The surviving auction record is sparse. Descriptions such as “few” and “rare” reflect what has appeared for sale; the factory production total remains unknown.

Movement notes

Cal. 1040 is automatic and built around the 1030 architecture, with added dead-second works. Christie’s, Phillips, Antiquorum and Sotheby’s list 26 jewels for the examples they describe. The movement guide covers the caliber and the conflicting accounts of ref. 1020.

The seconds mechanism uses a longer second intermediate wheel than the standard 1030. Berlow found that wheel intact in the 1040 he restored in 2015. He says parts of the worn automatic train can use 1030 components, and repeats collector reports that Rolex sometimes replaced the dead-beat module with 1030 parts; he had not seen such a replacement himself. Hodinkee’s 2016 review says the function was often removed during service, though its photographed watch still ticked. These secondary accounts leave the scale of the service work unclear, and none identifies a specific module replacement. A sweeping hand alone cannot show what work was done.

Cal. 1040 in Antiquorum’s 18K gold ref. 6556, lot 357 (2021).

Dial map

Photographed examples show silvered sector or crosshair dials with applied baton markers; several have a red seconds hand. A 1955 18K watch is catalogued with a gilt dial. The line divides the silvered dial into four quadrants in the examples shown. Wording below six includes “Superlative Chronometer Officially Certified” and “Superlative Chronometer by Official Test”; the records reviewed here leave their chronology unclear.

Christie’s says Rolex used “Tru-Beat” or “Metropolitan” according to market, and that the model name usually appeared on the dial. Monaco Legend’s 2026 catalogue describes a 1955 steel example with “Metropolitan” on its dial, silver sunburst finish, pink-gold markers and alpha hands. It calls the configuration U.S.-exclusive, though the catalogue gives no period Rolex source for that claim. Treat Metropolitan here as a market name; its status as a separate series or U.S.-exclusive option remains unresolved.

Steel ref. 6556 dial signed “Metropolitan,” Monaco Legend Auctions lot 37.

Hodinkee’s 2016 review leaves the seconds hand on its photographed example unresolved. Auction images show appearance; originality to the case requires further evidence.

Case, bezel, crystal, and crown notes

The examined lots describe a screw-back Oyster case with a smooth bezel. Steel and gold examples measure 34 or 35 mm. Christie’s specifies a screw-down crown and plastic crystal on its 1955 gold watch. Other catalogues omit one or both details, so the 1955 description remains example-specific.

Christie’s, Phillips and Antiquorum document yellow-gold 6556s. Antiquorum describes steel as the predominant case metal and gold examples as few; that is an auction-house estimate, not a factory tally. Antiquorum also mentions pink gold; the cited records contain no photograph of a pink-gold 6556.

Yellow-gold ref. 6556, Antiquorum Hong Kong lot 357 (2021).
Inside caseback stamped 6556, same Antiquorum lot.

Bracelets, end links, clasps, and packaging notes

Auction catalogues show riveted Oyster bracelets on steel and gold examples. Phillips describes an 18K bracelet with end link 57 on its 1956 gold 6556; Antiquorum identifies a gold ref. 7205/57 on its circa-1962 example. Christie’s records a steel bracelet, while Sotheby’s 2026 lot 2131 lists a steel Oyster bracelet without a reference number. A separate 1968 Antiquorum lot shows a steel 7205/57 bracelet by itself. These are observed auction combinations; factory delivery across the reference remains unproven.

Hodinkee’s 2016 photograph shows a gap at the end links, which the author judged incorrect for that watch. Check fit against the individual case. Boxes, guarantees and service papers appear with some lots; treat boxes as period accessories and papers as watch-specific only when they identify that watch.

Gold 7205/57 bracelet attached to Phillips’s 1956 ref. 6556, lot 111.
Standalone steel 7205/57 bracelet, Antiquorum Geneva lot 310 (1968).

Special branches

Auction records show individual metal and dial combinations; the full factory-option list remains uncertain. Phillips catalogues one black-dial watch as ref. 6558, while its inside caseback is stamped 6556; the listing identifies Cal. 1040 with 26 jewels. The lot leaves 6558’s status unclear: the catalogue names the exterior 6558 and shows an inner 6556 stamp. The black dial remains a feature of that particular listing.

Antiquorum’s 2012 catalogue and Dr. Crott’s 2019 listing describe ref. 1020 as a planned 6556 successor that never launched, citing a 1960 Rolex catalogue. Neither listing reproduces the cited page. Crott’s 2012 catalogue instead calls 1020 a new caliber intended to replace Cal. 1040. Colin A. White’s The Vintage Rolex Field Manual separately lists ref. 1020 with Cal. 1560, a smooth bezel and a full-size case; the book gives no example or citation. The surviving accounts leave open whether 1020 was only a proposal or also a separate Oyster Perpetual reference.

Historical market and auction record

date assigned	example	catalogue record
1955	18K gold, gilt dial, Cal. 1040, 34 mm	Christie’s, case 112846
1956	18K yellow gold, Cal. 1040, bracelet stamped 57, 35 mm	Phillips, case 139606; sold CHF 27,500
circa 1956	steel, Cal. 1040, 26 jewels, 35 mm, Oyster bracelet	Sotheby’s, case 139035, lot 2131
1956	steel, Cal. 1040, 26 jewels, 35 mm	Antiquorum, case 139412, lot 120
circa 1961	steel, silver sector dial, red seconds, 35 mm	Antiquorum, case 731422; sold CHF 9,375
circa 1961	steel example with medals, letter and service receipt	Phillips, case 138763; sold CHF 28,750
circa 1962	18K yellow gold, bracelet 7205/57, 35 mm	Antiquorum, case 739524; sold HKD 512,500

Case 731422 appears in both Antiquorum’s 2020 and Sotheby’s 2024 listings, so those catalogue entries describe one watch. Prices belong to the individual sale records.

Gallery

Steel 6556 with silvered crosshair dial and red seconds, Antiquorum Geneva lot 215 (2020).
Steel dial signed Metropolitan, Monaco Legend lot 37.
Yellow-gold example, Antiquorum Hong Kong lot 357.
Cal. 1040, Antiquorum Hong Kong lot 357.
Inside caseback stamped 6556, Antiquorum Hong Kong lot 357.
Gold 7205/57 bracelet with Phillips’s 1956 ref. 6556, lot 111.
Standalone steel 7205/57 bracelet, Antiquorum Geneva lot 310 (1968).