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Breitling Colt Automatic Chronograph Steel/Steel
TOP
Breitling Colt Automatic Chronograph Steel/Steel
$3,280
Free shipping
Seller
The Luxury Well
167
US
Chopard Two O Ten Tycoon
TOP
Chopard Two O Ten Tycoon
$3,800
Seller
Eternity Jewelry Corp dba Happy Jewelers
17
US
Rolex Day-Date Dinosaur Egg Tridor Gold 18239B
TOP
Rolex Day-Date Dinosaur Egg Tridor Gold 18239B
$25,627
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
265
UK
Rolex Yacht-Master II SS/Everose Gold White Dial - 116681
TOP
Rolex Yacht-Master II SS/Everose Gold White Dial - 116681
$18,500
Free shipping
Seller
Certified Luxury Watches
91
US
Rolex Men's Steel 40mm Submariner Date Box Books Black Dial Bezel
TOP
Rolex Men's Steel 40mm Submariner Date Box Books Black Dial Bezel
$7,687
Free shipping
Seller
Mt. Vernon Specialties
13
US
Omega Speedmaster Dark Side of the Moon - Factory Warranty - NEW
TOP
Omega Speedmaster Dark Side of the Moon - Factory Warranty - NEW
$7,575
Seller
Watch Exchange Co.
147
US
Omega Speedmaster Racing 326.30.40.50.06.001
TOP
Omega Speedmaster Racing 326.30.40.50.06.001
$3,100
Seller
Scorpio Luxury Corp
36
US
Rolex Datejust 126334 Slate Roman
Rolex Datejust 126334 Slate Roman
$9,200
Seller
Labelle Jewelry
59
US
Rolex Sea-Dweller Sea-Dweller 126600 SD43 NEW
Rolex Sea-Dweller Sea-Dweller 126600 SD43 NEW
$13,895
Seller
Kara's Watches
181
US
A. Lange & Söhne A  1815 Up & Down 221.021 36MM Power Reserve...
A. Lange & Söhne A 1815 Up & Down 221.021 36MM Power Reserve...
$14,995
Seller
ExpertsWatches
 
US
Omega Deville RG Hour Vision  Co Axial
Omega Deville RG Hour Vision Co Axial
$13,900
Seller
VALOBRA Jewelry & Antiques
 
US
Rolex Datejust 41 Steel & White Gold Blue Index Dial  126334
Rolex Datejust 41 Steel & White Gold Blue Index Dial 126334
$9,499
Free shipping
Seller
Avi & Co NY
99
US
Patek Philippe Grand Complication
Patek Philippe Grand Complication
$300,000
Seller
TIMEVAULT
 
US
F.P.Journe Chronometre Resonance Platinum Silver Dial 40MM...
F.P.Journe Chronometre Resonance Platinum Silver Dial 40MM...
$48,900
Seller
European Watch Company
189
US
Omega Planet Ocean 42mm Titanium - Blue - Unworn Condition
TOP
Omega Planet Ocean 42mm Titanium - Blue - Unworn Condition
$4,775
Seller
Watch Exchange Co.
147
US
Omega Speedmaster Racing 326.30.40.50.06.001
TOP
Omega Speedmaster Racing 326.30.40.50.06.001
$3,100
Seller
Scorpio Luxury Corp
36
US
Rolex Datejust 41 126334 Slate Roman
Rolex Datejust 41 126334 Slate Roman
$9,130
Seller
Labelle Jewelry
59
US
Omega Seamaster Railmaster Black NEW 220.10.40.20.01.001
Omega Seamaster Railmaster Black NEW 220.10.40.20.01.001
$3,995
Seller
Kara's Watches
181
US
Rolex Oyster Perpetual 6564 Watch NEW TUBE & CROWN CAL 1030 W/...
Rolex Oyster Perpetual 6564 Watch NEW TUBE & CROWN CAL 1030 W/...
$2,200
Seller
ExpertsWatches
 
US
Chopard Mille Miglia Gran Turismo Limited edition
Chopard Mille Miglia Gran Turismo Limited edition
$16,500
Seller
VALOBRA Jewelry & Antiques
 
US
Rolex : Explorer II :  16570 :  Stainless Steel : black...
Rolex : Explorer II : 16570 : Stainless Steel : black...
$4,530
Seller
Bernard Watch Co.
286
US
Ulysse Nardin Maxi Marine Diver
Ulysse Nardin Maxi Marine Diver
$17,900
Seller
Chad Warrick
16
US
Rolex Sea-Dweller "Red" PVD/DLC Steel Ceramic Watch 126600
Rolex Sea-Dweller "Red" PVD/DLC Steel Ceramic Watch 126600
$14,699
Free shipping
Seller
Avi & Co NY
99
US
Rolex Bubble Back (C24-54)
Rolex Bubble Back (C24-54)
$4,850
Seller
Knight Watch & Jewelry Co.
7
US
Omega Speedmaster Racing 326.30.40.50.06.001
TOP
Omega Speedmaster Racing 326.30.40.50.06.001
$3,100
Seller
Scorpio Luxury Corp
36
US
Omega Seamaster Diver 300 M Blue dial 212.30.41.20.03.001
Omega Seamaster Diver 300 M Blue dial 212.30.41.20.03.001
$2,935
Seller
Harley's Time LLC
227
US
Omega Speedmaster Moonwatch Moonphase NEW 304.30.44.52.01.00
Omega Speedmaster Moonwatch Moonphase NEW 304.30.44.52.01.00
$6,795
Seller
Kara's Watches
181
US
Omega REF 2279-2 Pre SpeedMaster Cal 321 Chronograph Watch
Omega REF 2279-2 Pre SpeedMaster Cal 321 Chronograph Watch
$5,000
Seller
ExpertsWatches
 
US
Rolex 1675 GMT Master "Blueberry" MKII SS (30054)
Rolex 1675 GMT Master "Blueberry" MKII SS (30054)
$39,900
Seller
European Watch Company
189
US
Rolex : GMT-Master II :  116710 :  Stainless Steel : black dial
Rolex : GMT-Master II : 116710 : Stainless Steel : black dial
$7,930
Seller
Bernard Watch Co.
286
US
Ulysse Nardin Marine Chronometer Manufacture
Ulysse Nardin Marine Chronometer Manufacture
$28,000
Seller
Chad Warrick
16
US
Rolex Datejust 41 Steel & White Gold Black Diamond Jubilee 126334
Rolex Datejust 41 Steel & White Gold Black Diamond Jubilee 126334
$10,999
Free shipping
Seller
Avi & Co NY
99
US
Chopard Mille Miglia
Chopard Mille Miglia
$4,299
Free shipping
Seller
Express Watches
7
US
TAG Heuer Carrera Automatic Leather Mens Watch
TAG Heuer Carrera Automatic Leather Mens Watch
$2,517
Seller
Jacob Time
 
US
Omega Seamaster Diver 300 M Black dial 212.30.41.20.01.003
Omega Seamaster Diver 300 M Black dial 212.30.41.20.01.003
$2,935
Seller
Harley's Time LLC
227
US
Omega Speedmaster Moonwatch Moonphase NEW 304.33.44.52.03.001
Omega Speedmaster Moonwatch Moonphase NEW 304.33.44.52.03.001
$7,245
Seller
Kara's Watches
181
US
Omega SeaMaster Gold Top Chronograph Cal 321 Watch 145.005 Box
Omega SeaMaster Gold Top Chronograph Cal 321 Watch 145.005 Box
$4,000
Seller
ExpertsWatches
 
US
Rolex 16600 Sea Dweller SS FULL SET (30071)
Rolex 16600 Sea Dweller SS FULL SET (30071)
$9,500
Seller
European Watch Company
189
US
Rolex : Submariner Date :  16610 :  Stainless Steel : black dial
Rolex : Submariner Date : 16610 : Stainless Steel : black dial
$8,030
Seller
Bernard Watch Co.
286
US
Roger Dubuis Sympathie
Roger Dubuis Sympathie
$29,500
Seller
Beverly Hills Watch Company
34
US
Rolex Datejust 41 Steel & White Gold Blue Diamond  Jubilee ...
Rolex Datejust 41 Steel & White Gold Blue Diamond Jubilee ...
$11,199
Free shipping
Seller
Avi & Co NY
99
US
Omega Seamaster Planet Ocean
Omega Seamaster Planet Ocean
$7,388
Seller
Chad Warrick
16
US
Chopard Mille Miglia GMT, Ref 8992
Chopard Mille Miglia GMT, Ref 8992
$3,775
Seller
PreOwned Watch Shop
23
US
Omega Sea Master Diver 300 blue dial 42 mm Co-Axial Chro
Omega Sea Master Diver 300 blue dial 42 mm Co-Axial Chro
$3,975
Seller
Harley's Time LLC
227
US
Omega Seamaster Olympic Official Timekeeper Black/Green NEW
Omega Seamaster Olympic Official Timekeeper Black/Green NEW
$4,995
Seller
Kara's Watches
181
US
Breitling Navitimer 1461 A19022 Chronograph Perpetual Calendar...
Breitling Navitimer 1461 A19022 Chronograph Perpetual Calendar...
$5,796
Seller
ExpertsWatches
 
US
Omega 233.32.41.21.01.001 Omega Seamaster 300M Limited Edition...
Omega 233.32.41.21.01.001 Omega Seamaster 300M Limited Edition...
$10,500
Seller
European Watch Company
189
US
Rolex : Datejust 36mm :  16014 :  Stainless Steel : refinished...
Rolex : Datejust 36mm : 16014 : Stainless Steel : refinished...
$3,395
Seller
Bernard Watch Co.
286
US
Chopard Mille Miglia Power Reserve
Chopard Mille Miglia Power Reserve
$4,499
Free shipping
Seller
Express Watches
7
US
Panerai Luminor 1950 Stainless Steel Watch PAM00127
Panerai Luminor 1950 Stainless Steel Watch PAM00127
$19,499
Free shipping
Seller
Avi & Co NY
99
US
Omega Seamaster Planet Ocean
Omega Seamaster Planet Ocean
$7,500
Seller
Chad Warrick
16
US
Omega Seamaster Planet Ocean   2218.50
Omega Seamaster Planet Ocean 2218.50
$4,935
Seller
PreOwned Watch Shop
23
US
Rolex Datejust 41 mm rhodium dial Oyster Band 126334
Rolex Datejust 41 mm rhodium dial Oyster Band 126334
$9,075
Seller
Harley's Time LLC
227
US
Omega Seamaster Planet Ocean Big Blue 600 M GMT NEW
Omega Seamaster Planet Ocean Big Blue 600 M GMT NEW
$7,545
Seller
Kara's Watches
181
US
Longines Ultra Chron 18K Gold Cal 431 36000 BTU
Longines Ultra Chron 18K Gold Cal 431 36000 BTU
$2,195
Seller
ExpertsWatches
 
US
Rolex 116515LN Cosmograph Daytona 18K Rose Gold / Chocolate...
Rolex 116515LN Cosmograph Daytona 18K Rose Gold / Chocolate...
$25,500
Seller
European Watch Company
189
US
Rolex : GMT-Master II 'Coke' :  16710 :  Stainless Steel :...
Rolex : GMT-Master II 'Coke' : 16710 : Stainless Steel :...
$10,815
Seller
Bernard Watch Co.
286
US
Rolex 41mm Datejust 126334 Jubilee Band Rhodium Index Dial 18k...
Rolex 41mm Datejust 126334 Jubilee Band Rhodium Index Dial 18k...
$8,495
Seller
Sam's Watches
 
US
Rolex Datejust 41 Steel & White Gold Grey Green Roman Dial 126334
Rolex Datejust 41 Steel & White Gold Grey Green Roman Dial 126334
$9,199
Free shipping
Seller
Avi & Co NY
99
US
Ulysse Nardin GMT +/- Perpetual
Ulysse Nardin GMT +/- Perpetual
$30,400
Seller
Chad Warrick
16
US
Hublot Big Bang Pop Art King Gold Apple (Limited Edition)
TOP
Hublot Big Bang Pop Art King Gold Apple (Limited Edition)
$22,737
Free shipping
Seller
Istock LTD
120
LV
Rolex Datejust 41mm 126334 Roman Slate dial  Jubilee band
Rolex Datejust 41mm 126334 Roman Slate dial Jubilee band
$9,275
Seller
Harley's Time LLC
227
US
Omega Seamaster Planet Ocean 600 M Chrono NEW 215.33.46.51.03.001
Omega Seamaster Planet Ocean 600 M Chrono NEW 215.33.46.51.03.001
$5,495
Seller
Kara's Watches
181
US
Omega Constellation Gold on Steel Cal 564 168.010 Pie Pan 1970s
Omega Constellation Gold on Steel Cal 564 168.010 Pie Pan 1970s
$1,900
Seller
ExpertsWatches
 
US
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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.

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