Chronometer

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Omega Seamaster Professional 18k Gold Chronograph Automatic... Omega Seamaster Professional 18k Gold Chronograph Automatic... Ref. No. 2196.20.00; Yellow gold; Automatic; Condition 2 (fine); Location: United States, NY, New York Available immediately Premium Trusted Seller since 2014 Payment & processing through Chrono24 $13,499
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Rolex Oyster Perpetual GMT-Master II Ref. 116719BLRO Rolex Oyster Perpetual GMT-Master II Ref. 116719BLRO Ref. No. 116719BLRO; White gold; Automatic; Year 2015; With box; With papers; Location: United States, FL, Hollywood Available immediately Premium Trusted Seller since 2010 Payment & processing through Chrono24 $24,495
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Ulysse Nardin Maxi Marine Diver Early Version Yellow Gold... Ulysse Nardin Maxi Marine Diver Early Version Yellow Gold... Ref. No. 266-51; Yellow gold; Automatic; Condition 1 (mint); Location: United States, FL, North Miami Beach Available immediately Premium Trusted Seller since 2008 Payment & processing through Chrono24 $11,330
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A. Lange & Söhne Datograph Flyback Platinum A. Lange & Söhne Datograph Flyback Platinum Ref. No. 403035; Platinum; Manual winding; Condition 1 (mint); With box; With papers; Location: United States, MA, Boston Available immediately Premium Trusted Seller since 2009 Payment & processing through Chrono24 $46,500
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Ulysse Nardin El Toro 322-00-3 Ulysse Nardin El Toro 322-00-3 Ref. No. 322-00-3; Pink gold; Automatic; Condition 0 (unworn); Location: United States, PA, Southampton Available immediately Premium Trusted Seller since 2010 Payment & processing through Chrono24 $32,000
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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 Premium Trusted Seller since 2012 Payment & processing through Chrono24 $17,500
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Omega Seamaster Aqua Terra 231.13.39.21.06.001 Omega Seamaster Aqua Terra 231.13.39.21.06.001 Ref. No. 231.13.39.21.06.001; Steel; Automatic; Condition 1 (mint); Location: United States, PA, Philadelphia Available immediately Premium Trusted Seller since 2012 Payment & processing through Chrono24 $3,350
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Omega Constellation Co-axial Chronometer Automatic, C2010 (1003) Omega Constellation Co-axial Chronometer Automatic, C2010 (1003) Steel; Automatic; Condition 1 (mint); Year 2010; Location: United States, CA, LOS ANGELES Available immediately Premium Trusted Seller since 2014 Payment & processing through Chrono24 $3,139
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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 Premium Trusted Seller since 2013 Payment & processing through Chrono24 $15,700
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Rolex Men's Rolex Oyster Perpetual Day-Date Platinum... Rolex Men's Rolex Oyster Perpetual Day-Date Platinum... Ref. No. 18206; Platinum; Automatic; Condition 1 (mint); Year 1995; Location: United States, NY, New York Available immediately Premium Trusted Seller since 2014 Payment & processing through Chrono24 $20,499
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Rolex Oyster Perpetual GMT-Master Black PVD Ref. 16700 Rolex Oyster Perpetual GMT-Master Black PVD Ref. 16700 Ref. No. 16700; Automatic; Year 1996; Location: United States, FL, Hollywood Available immediately Premium Trusted Seller since 2010 Payment & processing through Chrono24 $5,795
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Ulysse Nardin GMT Perpetual 18K White Gold White Dial Black... Ulysse Nardin GMT Perpetual 18K White Gold White Dial Black... Ref. No. 320-60/60; White gold; Automatic; Condition 0 (unworn); Location: United States, FL, North Miami Beach Available immediately Premium Trusted Seller since 2008 Payment & processing through Chrono24 $36,260
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Blancpain Extra Slim White Dial Manual Wind SS Blancpain Extra Slim White Dial Manual Wind SS Ref. No. 7002112761; Steel; Manual winding; Condition 1 (mint); With box; With papers; Location: United States, MA, Boston Available immediately Premium Trusted Seller since 2009 Payment & processing through Chrono24 $6,600
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Ulysse Nardin Maxi Marine Diver Chronometer 263-33-3/92 Ulysse Nardin Maxi Marine Diver Chronometer 263-33-3/92 Ref. No. 263-33-3/92; Steel; Automatic; Condition 0 (unworn); With box; Location: United States, PA, Southampton Available immediately Premium Trusted Seller since 2010 Payment & processing through Chrono24 $3,589
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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 Premium Trusted Seller since 2012 Payment & processing through Chrono24 $6,250
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Omega Seamaster Racing Chronometer 2269.52.00 Omega Seamaster Racing Chronometer 2269.52.00 Ref. No. 2269.52.00; Titanium; Automatic; Condition 2 (fine); With box; With papers; Location: United States, PA, Philadelphia Available immediately Premium Trusted Seller since 2012 Payment & processing through Chrono24 $3,450
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Rolex 16014 Quickset Mens Rare Vintage 1984 18k Gold Stainless... Rolex 16014 Quickset Mens Rare Vintage 1984 18k Gold Stainless... Automatic; Condition 1 (mint); Location: United States, CA, LOS ANGELES Available immediately Premium Trusted Seller since 2014 Payment & processing through Chrono24 $3,890
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Ulysse Nardin Sonata Silicium Cathedra 670-85 Ulysse Nardin Sonata Silicium Cathedra 670-85 Ref. No. 670-85; White gold; Automatic; Condition 3 (fair); Year 2010; With box; With papers; Location: United States, CA, Beverly Hills Available immediately Premium Trusted Seller since 2013 Payment & processing through Chrono24 $29,500
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Patek Philippe Men's 18k Yellow Gold  Calatrava 3919... Patek Philippe Men's 18k Yellow Gold Calatrava 3919... Ref. No. 3919; Yellow gold; Manual winding; Condition 1 (mint); Location: United States, NY, New York Available immediately Premium Trusted Seller since 2014 Payment & processing through Chrono24 $8,999
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Corum Admiral's Cup Competition Ref. 947.933.04/0373 Corum Admiral's Cup Competition Ref. 947.933.04/0373 Ref. No. 947.933.04; Titanium; Automatic; Year 2013; With box; With papers; Location: United States, FL, Hollywood Available immediately Premium Trusted Seller since 2010 Payment & processing through Chrono24 $3,795
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Chopard Mille Miglia Gran Turismo XL Power Reserve Chronometer... Chopard Mille Miglia Gran Turismo XL Power Reserve Chronometer... Ref. No. 168457-3002; Steel; Automatic; Condition 1 (mint); Location: United States, FL, North Miami Beach Available immediately Premium Trusted Seller since 2008 Payment & processing through Chrono24 $5,075
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Breitling SuperOcean Chronograph II Blue Accents SS / Rubber Breitling SuperOcean Chronograph II Blue Accents SS / Rubber Ref. No. A1334102/BA83; Steel; Automatic; Condition 1 (mint); With box; With papers; Location: United States, MA, Boston Available immediately Premium Trusted Seller since 2009 Payment & processing through Chrono24 $3,700
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Ulysse Nardin Maxi Diver 263-33-3/95 Ulysse Nardin Maxi Diver 263-33-3/95 Ref. No. 263-33-3/95; Steel; Automatic; Condition 0 (unworn); Location: United States, PA, Southampton Available immediately Premium Trusted Seller since 2010 Payment & processing through Chrono24 $3,745
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Zenith stainless steel Chronomaster Moon Zenith stainless steel Chronomaster Moon Steel; Automatic; Condition 1 (mint); With box; Location: United States, MA, Boston Available immediately Premium Trusted Seller since 2008 Payment & processing through Chrono24 $4,500
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Ulysse Nardin Chronometer Ulysse Nardin Chronometer Ref. No. Vintage; Yellow gold; Manual winding; Condition 2 (fine); With box; Location: United States, PA, Philadelphia Available immediately Premium Trusted Seller since 2012 Payment & processing through Chrono24 $4,850
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Longines Turler Admiral Chronometer Automatic S Steel Mens 70s... Longines Turler Admiral Chronometer Automatic S Steel Mens 70s... Steel; Automatic; Condition 1 (mint); Year 1970s; Location: United States, CA, LOS ANGELES Available immediately Premium Trusted Seller since 2014 Payment & processing through Chrono24 $1,289
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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); With box; With papers; Location: United States, NY, New York Available in 3-5 working days Premium Trusted Seller since 2012 Payment & processing through Chrono24 $4,990
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Chopard Men's Chopard Mille Miglia GT XL Gran Turismo... Chopard Men's Chopard Mille Miglia GT XL Gran Turismo... Ref. No. 16/8997; Steel; Automatic; Condition 2 (fine); Location: United States, NY, New York Available immediately Premium Trusted Seller since 2014 Payment & processing through Chrono24 $2,999
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Audemars Piguet Jules Audemars Chronometer With AP Escapement... Audemars Piguet Jules Audemars Chronometer With AP Escapement... Ref. No. 26153PT.OO.D028CR.01; Platinum; Manual winding; Year 2013; With box; With papers; Location: United States, FL, Hollywood Available immediately Premium Trusted Seller since 2010 Payment & processing through Chrono24 $199,995
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Ulysse Nardin Marine Chronometer Manufacture Stainless Steel... Ulysse Nardin Marine Chronometer Manufacture Stainless Steel... Ref. No. 1183-122-3/42; Steel; Automatic; Condition 0 (unworn); Location: United States, FL, North Miami Beach Available immediately Premium Trusted Seller since 2008 Payment & processing through Chrono24 $7,200
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Chronometer - Certified Precision

"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".

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.