Chronometer


"Chronometer" may sound like a fancy name for a normal watch - after all, it just comes from the Greek words for "time" and "measure" - but chronometers are really something quite special. Chronometers are watches, yes, but watches that have been tried and tested and certified to meet exacting precision standards. The COSC in Switzerland determines which watches may actually call themselves "chronometers". More...

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Rolex Oyster Perpetual DateJust Diamond Dial Watch 16000 Rolex Oyster Perpetual DateJust Diamond Dial Watch 16000 Ref. No. 16000; Gold/Steel; Automatic; Condition 2 (fine); Year 1986; Location: United Kingdom, WEST MIDLAND; 1) Dial : The Original dial has been repainted with after set Diamond Index attached to it. ( The... Available immediately $ 2,657   Watch details Patek Philippe 10 Day Power Reserve 18K Yellow Gold Patek Philippe 10 Day Power Reserve 18K Yellow Gold Ref. No. 5100J-001; Yellow gold; Manual winding; Condition 1 (mint); With Box; Location: United States, MA, Boston; Patek Philippe 5100 J 10 Day Power Reserve, 5100J-001, 5100J, Limited Edition of 1500 Pieces, 18k... Available immediately $ 44,500   9 Watch details
Zenith 22.1230.4002/21.C509 Ladies' Star Chronomaster,... Zenith 22.1230.4002/21.C509 Ladies' Star Chronomaster,... Ref. No. 22.1230.4002/21.C509; Pink gold; Automatic; Condition 1 (mint); Location: United States, AZ, Scottsdale; Condition: pre-owned, in mint condition. Box and papers: no box or papers. ... Available immediately $ 9,500   6 Watch details Ulysse Nardin Maxi Marine Chronometer 263-66-7 Ulysse Nardin Maxi Marine Chronometer 263-66-7 Ref. No. 263-66-7; Steel; Automatic; Condition 1 (mint); Location: United States, PA, Philadelphia; Pre-Owned Ulysse Nardin Maxi Marine Chronometer (263-66-7) automatic watch, features a 41mm... Available immediately $ 5,250   Watch details Breitling Navitimer (old II) 2-tone with Bracelet  MINT Breitling Navitimer (old II) 2-tone with Bracelet MINT Ref. No. D13022; Gold/Steel; Automatic; Condition 1 (mint); Year Circa 2000; With Papers; Location: United States, NY, New York; * COMES WITH SEA WAVE DIAMOND'S 1-YEAR LIMITED WARRANTY* This Navitimer is very hard to... Available immediately $ 6,250   1 Watch details Rolex YACHTMASTER II 18CT YELLOW GOLD UNWORN Rolex YACHTMASTER II 18CT YELLOW GOLD UNWORN Ref. No. 116688; Yellow gold; Automatic; Condition 0 (unworn); Year 2014; With Box; With Papers; Location: United Kingdom, London; ROLEX YACHTMASTER II 18CT YELLOW GOLD UNWORN List Price £29,100 CARR Price £22,350 One of... Available immediately $ 33,959   11 Watch details Ulysse Nardin GMT +/- Perpetual, Silver Dial, Limited Edition... Ulysse Nardin GMT +/- Perpetual, Silver Dial, Limited Edition... Ref. No. 322-66/91; Pink gold; Automatic; Location: United States, NY, New York; Super Exclusive & Extremely Rare Ulysse Nardin GMT +/- Perpetual Calendar Limited & Numbered... Available immediately price on request   17 Watch details Ulysse Nardin Chronometer Ulysse Nardin Chronometer Ref. No. 26333; Steel; Automatic; Location: United States, NY, New York; Weight: 129.7 g Available immediately $ 3,799   Watch details Breitling CHRONOMAT EVOLUTION YELLOW GOLD DIAMOND - LIMITED 25... Breitling CHRONOMAT EVOLUTION YELLOW GOLD DIAMOND - LIMITED 25... Ref. No. K1335663/A572; Yellow gold; Automatic; With Box; With Papers; Location: United States, NY, New York City; EXTREMELY RARE & EXCLUSIVE MODEL ~~~ BREITLNG CHRONOMAT EVOLUTION YELLOW GOLD DIAMOND **... Available immediately $ 33,500   14 Watch details
Blancpain 2885F.36B42.53B Leman Flyback Chronograph Men's... Blancpain 2885F.36B42.53B Leman Flyback Chronograph Men's... Pink gold; Automatic; Condition 0 (unworn); Year 2000 to Present; New; With Box; With Papers; Location: United States, NY, New York; Blancpain 2885F.36B42.53B Leman Flyback Chronograph Men's Watch - WITH MANUFACTURER... Available immediately $ 16,800   Watch details Graham Chronofighter SS Chronograph / Deployant Graham Chronofighter SS Chronograph / Deployant Ref. No. C.O.S.C.; Steel; Automatic; Condition 1 (mint); With Box; With Papers; Location: United States, MA, Boston Available immediately $ 3,400   9 Watch details Rolex GMT Master II Ceramic SS / SS Rolex GMT Master II Ceramic SS / SS Ref. No. 116710LN; Steel; Automatic; Condition 1 (mint); Year 2006; With Box; With Papers; Location: United States, MA, Boston; This is a 904L stainless steel Rolex GMT Master II, 116710LN. It includes an integral stainless... Available immediately $ 7,400   9 Watch details Rolex 18k Y/G Very Rare Wood Dial Day-Date Gents B&P 18038 Rolex 18k Y/G Very Rare Wood Dial Day-Date Gents B&P 18038 Ref. No. 18038; Yellow gold; Automatic; Condition 2 (fine); Year 1999; With Box; With Papers; Location: United Kingdom, London; An 18k Yellow Gold Oyster Perpetual Day-Date Gents Wristwatch, very rare wood dial with applied... Available immediately $ 14,435   2 Watch details Omega Seamaster Planet Ocean Chrono Black Dial Rubber Mens Watch Omega Seamaster Planet Ocean Chrono Black Dial Rubber Mens Watch Ref. No. 232.32.46.51.01.003; Steel; Automatic; Condition 1 (mint); Location: United States, NY, New York; *COMES WITH SEA WAVE DIAMOND'S 1-YEAR LIMITED WARRANTY* The Omega Seamaster Chrono Coaxial... Available immediately $ 4,950   1 Watch details Rolex COSMOGRAPH DAYTONA IN STAINLESS STEEL NEW Rolex COSMOGRAPH DAYTONA IN STAINLESS STEEL NEW Ref. No. 116520; Steel; Automatic; Condition 0 (unworn); Year 2014; With Box; With Papers; Location: United Kingdom, London; ROLEX COSMOGRAPH DAYTONA IN STAINLESS STEEL NEW This is the latest design Cosmograph Daytona... Available immediately price on request   11 Watch details Audemars Piguet Royal Oak Offshore Grand Prix, Limited Edition... Audemars Piguet Royal Oak Offshore Grand Prix, Limited Edition... Ref. No. 26290PO.OO.A001VE.01; Platinum; Automatic; Location: United States, NY, New York; Super Exclusive & Extremely Rare THE ONE & ONLY Audemars Piguet Grand Prix Platinum, Limited &... Available immediately $ 129,995   17 Watch details Audemars Piguet SCUBA DIVER RED BOUTIQUE ROYAL OAK OFFSHORE... Audemars Piguet SCUBA DIVER RED BOUTIQUE ROYAL OAK OFFSHORE... Ref. No. 15701ST.OO.D002CA.03; Steel; Automatic; Condition 0 (unworn); With Box; With Papers; Location: United States, NY, New York City; AUDEMARS PIGUET SCUBA BOUTIQUE RED "DIVER" - ROYAL OAK OFFSHORE STAINLESS STEEL - LIMITED... Available immediately $ 18,995   14 Watch details Audemars Piguet Royal Oak Offshore Rubens Barrichello III... Audemars Piguet Royal Oak Offshore Rubens Barrichello III... Ref. No. 26284RO.OO.D002CR.01; Red gold; Automatic; Location: United States, NY, New York; NO NEED FOR A FANCY INTRODUCTION FOR THIS BAD BOY...... AUDEMARS PIGUET BARRICHELLO III... Available immediately $ 84,995   17 Watch details IWC IW545407 Portuguese Automatic Stainless Steel Mens Watch IWC IW545407 Portuguese Automatic Stainless Steel Mens Watch Steel; Manual winding; Condition 0 (unworn); Year 2011; New; With Box; With Papers; Location: United States, NY, New York; NEW IWC IW545407 Portuguese Automatic Stainless Steel Mens Watch Watch Information Brand,... Available immediately $ 5,450   Watch details Audemars Piguet JALAN BUKIT BINTANG WALK "KILL BILL"... Audemars Piguet JALAN BUKIT BINTANG WALK "KILL BILL"... Ref. No. 26115TI.OO.D002CR.01; Titanium; Automatic; Condition 0 (unworn); With Box; With Papers; Location: United States, NY, New York City; The Audemars Piguet Royal Oak Offshore - Jalan Bukit Bintang Edition was kicked off with a launch... Available immediately $ 33,995   14 Watch details Ulysse Nardin 320-60 Limited Edition GMT +/- Perpetual... Ulysse Nardin 320-60 Limited Edition GMT +/- Perpetual... Ref. No. 320-60; White gold; Automatic; Condition 1 (mint); Location: United States, AZ, Scottsdale; Condition: pre-owned, in mint condition. Box and papers: no box or papers. ... Available immediately $ 22,750   6 Watch details Omega Chronometer Omega Chronometer Ref. No. 431.13.41.21.02.001; Steel; Automatic; Condition 0 (unworn); New; With Box; With Papers; Location: United States, NY, New York; Weight: 84.5 g Available immediately $ 5,580   Watch details Chopard Mille Miglia "Super Fast" Classic Racing 18kt... Chopard Mille Miglia "Super Fast" Classic Racing 18kt... Ref. No. 161276; Pink gold; Automatic; Condition 1 (mint); Location: United States, NY, New York; * COMES WITH SEA WAVE DIAMOND'S 1-YEAR EXTENDED LIMITED WARRANTY * Price Reduced!!!... Available immediately $ 17,500   1 Watch details Rolex 116713LN  GMT-MASTER II SS/YG 18K Rolex 116713LN GMT-MASTER II SS/YG 18K Ref. No. 116713LN GMT-MASTER II; Gold/Steel; Automatic; Condition 1 (mint); Year 2006; With Box; With Papers; Location: United Kingdom, LONDON or PARIS; ROLEX GMT-Master 2 Ceramic Bezel Steel/Gold 18K full set 1st series !!!! Ref. : 116713LN Ye... Available immediately $ 8,610   Watch details Rolex 18k White Gold Silver Roman Dial Day-Date Gents B&P... Rolex 18k White Gold Silver Roman Dial Day-Date Gents B&P... Ref. No. 18239; White gold; Automatic; Condition 2 (fine); Year 1996; With Box; With Papers; Location: United Kingdom, London; An 18k White Gold Oyster Perpetual Day-Date Gents Wristwatch, silver dial with roman numerals,... Available immediately $ 14,055   2 Watch details Rolex 16570 Explorer II, Steel, F Series Rolex 16570 Explorer II, Steel, F Series Ref. No. 16570; Steel; Automatic; Condition 1 (mint); With Papers; Location: United States, AZ, Scottsdale; Condition: pre-owned, in mint condition. Box and papers: with papers and hang-tags; no... Available immediately $ 4,400   6 Watch details Rolex Submariner Date - Discontinued 40mm Rolex Submariner Date - Discontinued 40mm Ref. No. 16610; Steel; Automatic; Condition 1 (mint); Year 2004; Location: United Kingdom, London; The ultimate dive watch, Rolex's ref.16610 Submariner Date is water resistant to 300m, sports a... Available immediately $ 6,382   Watch details Blancpain 2041.3642.M53B Leman GMT Alarm 18K RG Men's Watch Blancpain 2041.3642.M53B Leman GMT Alarm 18K RG Men's Watch Pink gold; Automatic; Condition 0 (unworn); Year 2000 to Present; New; With Box; With Papers; Location: United States, NY, New York; Brand New 2041.3642.M53B Leman GMT Alarm 18K RG Men's Watch Further Specifications: - Power... Available immediately $ 17,000   Watch details Rolex 17000 Oysterquartz-Datejust box and paper Rolex 17000 Oysterquartz-Datejust box and paper Ref. No. 17000; Steel; Quartz; Condition 1 (mint); Year 1990; With Box; With Papers; Location: United Kingdom, LONDON OR PARIS; Model : Oysterquartz Datejust box and paper Ref. : 17000 Year : 1990 Case : Stainless... Available immediately $ 3,346   Watch details Rolex Yacht Master SS Platinum Bezel Rolex Yacht Master SS Platinum Bezel Ref. No. COSC; Steel; Automatic; Condition 1 (mint); Year 2004; With Box; Location: United States, MA, Boston; Rolex 16622 Yacht Master Oyster Perpetual Date, Stainless Steel on a Stainless Steel Oyster... Available immediately $ 7,200   9 Watch details
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The Oceanic Origins of Chronometers

Though the Swiss set the standard, the English coined the word. In the quest to calculate the longitude, the Englishman Jeremy Thacker, a clockmaker of extraordinary skill, created a series of increasingly accurate clocks, well beyond what had had previously been achieved. The clocks were intended to be used aboard ships and had to keep absolutely accurate time in order to allow for calculating longitude precisely, and thus fixing the position of the ship in the vast ocean. The last of Thacker's chronometers was actually more like a very large pocket watch.

Other clockmakers - and increasingly watchmakers - copied from and improved upon Thacker's final chronometer, producing watches of greater and greater precision. The original standards for accuracy were actually far more exacting than those currently maintained by the COSC in Switzerland, so very few watches were certified as chronometers and thus very few were actually produced and sold. The original chronometer requirements for mechanical watches are no longer necessary, since digital watches can already exceed them, but chronometers are still manufactured and sold (and resold) today as examples of extremely fine precision engineering. The use of jewels and precious metals in watches owes its origins to chronometers - these materials were used to make the mechanical movements as precise as possible.

Officially Certified Chronometers

Chronometers are no longer rare. More than a million Officially Certified Chronometer certificates are issued each year. Those watches that pass the most rigorous of the COSG's tests are rewarded with a special serial number and, indeed, the right to call themselves "chronometers" at all. Chronometers must meet several requirements: they must display the seconds; they must be highly precise; they must demonstrate that precision over the course of several consecutive days of testing; they must perform precisely in different positions and at different temperatures.

Chronometers in Everyday Use

This may sound extreme, but such reliability was crucial for individuals and groups that had to rely on the precision of portable mechanical timekeepers in the past. Pilots watches, for instance, needed to perform as chronometers (and those that did not had to be hackable). The famous B-Uhren, commissioned by the German Luftwaffe and manufactured by several companies, were chronometer-certified pilots watches - or chronometers that were used as pilots watches, depending on your perspective. Interestingly, despite the many years between Thacker's invention and the production of the B-Uhren, chronometers were still tightly bound to use in navigation.

First at sea, then in the air. And, still today, at sea again - or at least under it. Some diving watches, like the Rolex submariner, are also certified chronometers. Divers must be able to reliably track how long they've been under and how much time they have to surface.

Though their accuracy may have been eclipsed by digital watches, chronometers are still useful today.