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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Paul Picot Firshire 3000 Regulator Grey Stainless Steel Paul Picot Firshire 3000 Regulator Grey Stainless Steel Ref. No. 0740.S; Steel; Automatic; Condition 1 (mint); Year 2012; With Box; With Papers; Location: United States, FL, Hollywood Available immediately Payment & processing through Chrono24 $1,995   2 Watch details Omega Deville Hour Vision 431.63.41.21.02.001 Omega Deville Hour Vision 431.63.41.21.02.001 Ref. No. 431.63.41.21.02.001; Pink gold; Automatic; Condition 1 (mint); With Box; With Papers; Location: United States, PA, Philadelphia Available immediately Payment & processing through Chrono24 $9,350 Trusted Checkouts: 5   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 Available immediately Payment & processing through Chrono24 $6,250   1 Watch details Rolex 18k W/G O/P Silver Racing Arabic Dial Daytona B&P... Rolex 18k W/G O/P Silver Racing Arabic Dial Daytona B&P... Ref. No. 116509; White gold; Automatic; Condition 2 (fine); Year 2005; With Box; With Papers; Location: United Kingdom, London; An 18k White Gold Oyster Perpetual Cosmograph Daytona Gents Wristwatch, silver dial with applied... Available immediately $20,689   2 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 $39,900   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   5 Watch details Rolex Cosmograph Daytona, 116520 Rolex Cosmograph Daytona, 116520 Steel; Automatic; Condition 1 (mint); Year 2003; Location: United States, CA, LOS ANGELES Available immediately Payment & processing through Chrono24 $12,999   Watch details Omega Constellation Chronometer Gold Cap Steel Automatic Men... Omega Constellation Chronometer Gold Cap Steel Automatic Men... Gold/Steel; Automatic; Condition 2 (fine); Year 1961; Location: United Kingdom, WEST MIDLAND Available immediately Payment & processing through Chrono24 $1,404 Trusted Checkouts: 6   1 Watch details Rolex Submariner Date 'Hulk' - Box & Papers Rolex Submariner Date 'Hulk' - Box & Papers Ref. No. 116610LV; Steel; Automatic; Condition 1 (mint); Year 2013; With Box; With Papers; Location: United Kingdom, London Available immediately Payment & processing through Chrono24 $8,822   Watch details
Breitling Transocean Day-Date Ref. A4531012/BB69 43mm Stainles... Breitling Transocean Day-Date Ref. A4531012/BB69 43mm Stainles... Ref. No. A4531012/BB69; Steel; Automatic; Condition 1 (mint); Year 2015; With Box; With Papers; Location: United States, FL, Hollywood Available immediately Payment & processing through Chrono24 $3,495   2 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); With Box; With Papers; Location: United States, PA, Philadelphia Available immediately Payment & processing through Chrono24 $4,750 Trusted Checkouts: 5   Watch details Omega Constellation Double Eagle 1514.51.00 Omega Constellation Double Eagle 1514.51.00 Ref. No. 1514.51.00; Steel; Automatic; Condition 1 (mint); With Box; Location: United States, PA, Philadelphia Available immediately Payment & processing through Chrono24 $3,750 Trusted Checkouts: 5   Watch details Rolex 18k Y/G O/P Champagne Diamond Dial & Lugs Datejust... Rolex 18k Y/G O/P Champagne Diamond Dial & Lugs Datejust... Ref. No. 69238; Yellow gold; Automatic; Condition 2 (fine); Year 1996; With Box; With Papers; Location: United Kingdom, London; An 18k Yellow Gold Diamond Set Datejust Ladies Wristwatch, champagne dial with 10 applied round... Available immediately $11,320   2 Watch details Rolex Oyster Perpetual Day Date 18K Yellow Gold Rolex Oyster Perpetual Day Date 18K Yellow Gold Ref. No. COSC; Yellow gold; Automatic; Condition 1 (mint); Location: United States, MA, Boston; Rolex 1803 Oyster Perpetual Day-Date, 18K yellow gold on an 18K yellow gold President bracelet,... Available immediately $9,900   9 Watch details Omega Seamaster Professional Chronograph, Yellow Gold Omega Seamaster Professional Chronograph, Yellow Gold Ref. No. Reference: Movement: mechanical, with automatic winding;; Yellow gold; Automatic; Condition 1 (mint); Location: United States, AZ, Scottsdale; Total weight of this piece is approx. 9 ounces (255.15 grams)! Condition: pre-owned,... Available immediately $13,950   5 Watch details Graham Chronofighter Oversize 2OVAS.S02A.K10B Pre-owned Graham Chronofighter Oversize 2OVAS.S02A.K10B Pre-owned Ref. No. 2OVAS.S02A.K10B; Steel; Automatic; Condition 1 (mint); With Box; Location: United States, CA, Newport Beach Available immediately Payment & processing through Chrono24 $4,575   Watch details Rolex Submariner Date - 'Complete Set' Rolex Submariner Date - 'Complete Set' Ref. No. 16610; Steel; Automatic; Condition 1 (mint); Year 1999; With Box; With Papers; Location: United Kingdom, London Available immediately Payment & processing through Chrono24 $7,026   Watch details Omega Seamaster Planet Ocean 232.92.44.22.03.001 Pre-Owned Omega Seamaster Planet Ocean 232.92.44.22.03.001 Pre-Owned Ref. No. 232.92.44.22.03.001; Titanium; Automatic; Condition 1 (mint); With Box; With Papers; Location: United States, CA, Newport Beach Available immediately Payment & processing through Chrono24 $6,500   Watch details Panerai PAM 292 Radiomir Black Seal 45mm Black Ceramic Panerai PAM 292 Radiomir Black Seal 45mm Black Ceramic Ref. No. PAM00292; Ceramic; Manual winding; Condition 1 (mint); Year 2008; With Box; With Papers; Location: United States, FL, Hollywood Available immediately Payment & processing through Chrono24 $6,695   2 Watch details Panerai Luminor 1950 Rattrapante - 'Complete Set' Panerai Luminor 1950 Rattrapante - 'Complete Set' Ref. No. Pam 00213; Steel; Automatic; Condition 1 (mint); Year 2006; With Box; With Papers; Location: United Kingdom, London Available immediately Payment & processing through Chrono24 $9,759   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 Available immediately Payment & processing through Chrono24 $17,500   1 Watch details Rolex Oyster Perpetual Automatic Date Steel Mens Watch Ref# 1500 Rolex Oyster Perpetual Automatic Date Steel Mens Watch Ref# 1500 Ref. No. 1500; Steel; Automatic; Condition 2 (fine); Year 1978; Location: United Kingdom, WEST MIDLAND Available immediately Payment & processing through Chrono24 $2,731 Trusted Checkouts: 6   1 Watch details Rolex Oyster Perpetual Bubble Back 14K Rose Gold Rolex Oyster Perpetual Bubble Back 14K Rose Gold Ref. No. 3131.; Pink gold; Automatic; Condition 1 (mint); Location: United States, MA, Boston; Rolex 3131 Oyster Perpetual BUBBLE BACK, 14k Rose Gold on Leather Strap, Circa 1940, Super Oyster... Available immediately $5,200   9 Watch details Carl F. Bucherer 10614.02 Limited Edition Patravi Tribute to... Carl F. Bucherer 10614.02 Limited Edition Patravi Tribute to... Ref. No. 00.10614.02.33.01; White gold; Automatic; Condition 1 (mint); With Box; Location: United States, AZ, Scottsdale; Extremely Limited Edition of only 50 pieces, worldwide! Condition: pre-owned, in... Available immediately $13,500   5 Watch details Rolex 18k Tridor Cream Dial Diamond Set Mid-Size Datejust 68149 Rolex 18k Tridor Cream Dial Diamond Set Mid-Size Datejust 68149 Ref. No. 68149; White gold; Automatic; Condition 2 (fine); Year 1985; With Box; Location: United Kingdom, London; An 18k Tridor Oyster Perpetual Mid-Size Datejust Wristwatch, cream jubilee dial with applied... Available immediately $14,756   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 Available immediately Payment & processing through Chrono24 $4,950   1 Watch details Omega Constellation Chronometer Automatic Steel Mens Watch Omega Constellation Chronometer Automatic Steel Mens Watch Steel; Automatic; Condition 2 (fine); Year 1960; Location: United Kingdom, Birmingham Available immediately Payment & processing through Chrono24 $1,404 Trusted Checkouts: 6   1 Watch details Rolex Oyster Perpetual Datejust 26mm Tutone 18K Yellow Gold... Rolex Oyster Perpetual Datejust 26mm Tutone 18K Yellow Gold... Ref. No. 79173; Steel; Automatic; Year 2004; With Box; Location: United States, FL, Hollywood Available immediately Payment & processing through Chrono24 $3,995   2 Watch details Ulysse Nardin 333-88 Acqua Perpetual Calendar, Steel Ulysse Nardin 333-88 Acqua Perpetual Calendar, Steel Ref. No. 333-88; Steel; Automatic; Condition 1 (mint); With Papers; Location: United States, AZ, Scottsdale; Condition: pre-owned, in mint condition. Box and papers: with papers, bracelet and... Available immediately $11,950   5 Watch details Rolex Daytona 18K Yellow Gold Black Dial Watch Box Papers Rolex Daytona 18K Yellow Gold Black Dial Watch Box Papers Ref. No. 116523; Yellow gold; Automatic; Condition 1 (mint); With Box; With Papers; Location: United States, NY, Huntington Available immediately Payment & processing through Chrono24 $24,295   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.