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 Sky-Dweller GMT Annual Calender Ref.... Rolex Oyster Perpetual Sky-Dweller GMT Annual Calender Ref.... Ref. No. 326939; White gold; Automatic; Condition 1 (mint); Year 2015; With Box; With Papers; Location: United States, FL, Hollywood Available immediately Payment & processing through Chrono24 $36,895   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
Omega Constellation Automatic C.1960s Tapestry Dial #6526 Omega Constellation Automatic C.1960s Tapestry Dial #6526 Steel; Automatic; Condition 1 (mint); Year 1960s; Location: United States, CA, LOS ANGELES Available immediately Payment & processing through Chrono24 $899   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 Ulysse Nardin Quadrato Dual Time Perpetual White Gold 18K... Ulysse Nardin Quadrato Dual Time Perpetual White Gold 18K... White gold; Automatic; Condition 0 (unworn); Location: United States, FL, North Miami Beach Available immediately Payment & processing through Chrono24 $44,450   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 Available immediately Payment & processing through Chrono24 $15,700   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 Chronomaster Star 18K Rose Gold Chronograph Zenith Chronomaster Star 18K Rose Gold Chronograph Red gold; Automatic; Condition 1 (mint); With Box; With Papers; Location: United States, WA, Seattle; Retail Price: US$23000 We aim to source 100% authentic items in the most cost-effective ways,... Available immediately $8,450   1 Watch details Breitling H41360 Limited Edition Chrono-Matic, Red Gold Breitling H41360 Limited Edition Chrono-Matic, Red Gold Ref. No. H41360; Red gold; Automatic; Condition 1 (mint); Location: United States, AZ, Scottsdale; Limited Edition of only 250 pieces! Condition: pre-owned, in mint condition. ... Available immediately $11,300   5 Watch details
Panerai PAM 90 L Luminor Power Reserve Automatic 44mm Stainles... Panerai PAM 90 L Luminor Power Reserve Automatic 44mm Stainles... Ref. No. PAM00090 L; Steel; Automatic; Condition 1 (mint); Year 2009; With Box; With Papers; Location: United States, FL, Hollywood Available immediately Payment & processing through Chrono24 $5,995   2 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 Ulysse Nardin Maxi Marine Chronometer 266-66-3/62 Ulysse Nardin Maxi Marine Chronometer 266-66-3/62 Ref. No. 266-66-3/62; Pink gold; Automatic; Condition 1 (mint); With Box; With Papers; Location: United States, PA, Philadelphia Available immediately Payment & processing through Chrono24 $12,500 Trusted Checkouts: 5   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 Ulysse Nardin Quadrato Dual Time Perpetual White Gold 18K... Ulysse Nardin Quadrato Dual Time Perpetual White Gold 18K... White gold; Automatic; Condition 0 (unworn); Location: United States, FL, North Miami Beach Available immediately Payment & processing through Chrono24 $37,660   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 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 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 Yacht Master SS Platinum Bezel Rolex Yacht Master SS Platinum Bezel Ref. No. COSC; Steel; Automatic; Condition 1 (mint); Year 2002; With Box; Location: United States, MA, Boston; Rolex 16622 Yacht Master Oyster Perpetual Date, Stainless Steel on a Stainless Steel Oyster... Available immediately $6,400   9 Watch details Panerai PAM 438 O - Tuttonero Luminor 1950 3 Days GMT Cermamic... Panerai PAM 438 O - Tuttonero Luminor 1950 3 Days GMT Cermamic... Ref. No. PAM00438; Ceramic; Automatic; Condition 1 (mint); Year 2015; Location: United States, FL, Hollywood Available immediately Payment & processing through Chrono24 $11,695   2 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 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 Rolex Submariner with Date Box Papers Rolex Submariner with Date Box Papers Ref. No. 16610T; Steel; Automatic; Condition 1 (mint); Year 2005; With Box; With Papers; Location: United States, PA, Philadelphia Available immediately Payment & processing through Chrono24 $6,095   Watch details Ulysse Nardin Quadrato Dual Time Perpetual White Gold 18 K... Ulysse Nardin Quadrato Dual Time Perpetual White Gold 18 K... White gold; Automatic; Condition 0 (unworn); Location: United States, FL, North Miami Beach Available immediately Payment & processing through Chrono24 $37,660   Watch details Omega WP5260Omega Seamaster Planet Ocean 232.92.44.22.03.001... Omega WP5260Omega Seamaster Planet Ocean 232.92.44.22.03.001... 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 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 Omega Constellation Automatic Swiss Made Watch Omega Constellation Automatic Swiss Made Watch Steel; Automatic; Condition 1 (mint); Year 1968; Location: United States, CA, LOS ANGELES Available immediately Payment & processing through Chrono24 $1,795   Watch details Audemars Piguet Royal Oak Offshore Panda Chronograph Stainless... Audemars Piguet Royal Oak Offshore Panda Chronograph Stainless... Ref. No. 26170ST.OO.D101CR.02; Steel; Automatic; Condition 1 (mint); Year H; Location: United States, NY, New York Available immediately Payment & processing through Chrono24 $14,995   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 $6,495   2 Watch details Rolex President 69178 Pre-owned Rolex President 69178 Pre-owned Ref. No. 69178; Yellow gold; Automatic; Condition 1 (mint); With Box; Location: United States, CA, Newport Beach Available immediately Payment & processing through Chrono24 $7,450   Watch details Vacheron Constantin Malte Large Calendar 18k White Gold  ... Vacheron Constantin Malte Large Calendar 18k White Gold ... Ref. No. 42015/000G-8902; White gold; Automatic; Condition 1 (mint); With Box; Location: United States, FL, Aventura Available immediately Payment & processing through Chrono24 $10,900   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.