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Chopard Mille Miglia 168589-3012 New Steel 42mm Automatic United States of America, California, San Mateo
TOP
Chopard Mille Miglia Racing Colors Automatic White Dial Men's...
$5,199
Free shipping
Verified Dealer
3343
US
Rolex Datejust 126334 Very good Steel 41mm Automatic United States of America, New York, New York
TOP
Rolex Datejust 41 White Gold Rhodium Diamond Dial Watch 126334
$12,599
Free shipping
Verified Dealer
306
US
Omega De Ville Prestige 424.10.37.20.01.001 New Steel 36.8mm Automatic United States of America, California, San Mateo
TOP
Omega De Ville Prestige Co-Axial 36.8 mm Automatic Black Dial...
$2,729
Free shipping
Verified Dealer
3343
US
Ulysse Nardin Marine Chronometer 43mm 266-67/42 Very good Rose gold 43mm Automatic United States of America, Texas, Austin
TOP
Ulysse Nardin : Maxi Marine Chronometer : 266-67/42 : 18k...
$12,475
Verified Dealer
669
US
Panerai Special Editions PAM 00724 Good Steel 44mm Quartz United States of America, Wisconsin, La Crosse
TOP
Panerai Luminor Marina 8 Days Acciaio Limited Edition Oracle...
$7,397
Free shipping
Verified Dealer
US
TAG Heuer Carrera Heuer-02T CAR5A8K.FT6172 New Titanium 45mm Automatic United States of America, Florida, Aventura
TOP
TAG Heuer Calibre HEUER 02T Nanograph
$21,000
Verified Dealer
465
US
Omega Seamaster Planet Ocean 215.30.44.21.03.001 New Steel 43.5mm Automatic United States of America, New Jersey, Oradell
TOP
Omega Seamaster Planet Ocean 8900 43.5mm Blue Master Chronomet...
$4,995
Free shipping
Verified Dealer
495
US
Rolex GMT-Master II 16710T 116710 Very good Steel 40mm Automatic United States of America, Pennsylvania, HARRISBURG
TOP
Rolex GMT-Master II Stainless Steel Blue Red Pepsi Bezel Boxes...
$12,476
Free shipping
Verified Dealer
123
US
Tiffany 266-39-17940384 Very good Yellow gold 24.5mm Quartz United States of America, New York, Massapequa Park
TOP
Tiffany & Co. Mark Coupe Medium 18K Yellow Gold Quartz Diamond...
$4,994
Free shipping
Verified Dealer
713
US
Omega Seamaster Planet Ocean Chronograph 232.92.46.51.03.001 Very good Titanium 45.5mm Automatic United States of America, Florida, Miami
Omega Seamaster Planet Ocean
$6,500
Free shipping
Verified Dealer
20
US
Omega Seamaster Aqua Terra 231.10.44.50.06.001 Very good Steel 44mm Automatic United States of America, Florida, Pembroke Pines
TOP
Omega Seamaster Aqua Terra chronograph grey dial 44 mm...
$3,480
Verified Dealer
38
US
Rolex Datejust 126334 New Steel 41mm Automatic United States of America, New Jersey, Totowa
Rolex Datejust 41mm 126334 2020 BLUE INDEX STICKERS
$11,399
Verified Dealer
367
US
Chopard Mille Miglia 168543-3001 Unworn Steel 42mm Automatic United States of America, Illinois, Northfield
TOP
Chopard Jacky Ickx Edition V
$5,350
Free shipping
Verified Dealer
110
US
Omega Seamaster Planet Ocean 215.30.44.22.01.001 Very good Steel 43.5mm Automatic United States of America, Wisconsin, La Crosse
Omega Seamaster Planet Ocean 'Oreo' Master Chronometer GMT Diver
$5,697
Free shipping
Verified Dealer
20
US
Rolex Datejust 126334 Very good Steel 41mm Automatic United States of America, New York, New York
Rolex Datejust 41 Steel Silver Index Dial 41MM Watch 126334
$12,099
Free shipping
Verified Dealer
306
US
Rolex Datejust 16014 Steel 36mm Automatic United States of America, New York, New York
TOP
Rolex Oyster Perpetual Datejust 16014 Mens Watch
$5,299
Verified Dealer
416
US
Rolex Datejust 126334 Unworn Steel 41mm Automatic United States of America, California, Santa Monica
TOP
Rolex Datejust 41 'UNWORN' 2020 Blue Dial Oyster Fluted Gold...
$10,950
Verified Dealer
88
US
Rolex Datejust 126334 New Steel 41mm Automatic United States of America, Florida, Hollywood
TOP
Rolex Datejust 41mm Navy Blue Index Jubilee 126334
$13,885
Verified Dealer
781
US
Breitling Navitimer Heritage A13324121G1X1 Unworn Steel 41mm Automatic United States of America, Massachusetts, Boston
Breitling Navitimer Chronograph 41 Stainless Steel 41mm A13324
$4,980
Verified Dealer
33
US
Breitling Navitimer 8 A17314101B1X1 New Steel 41mm Automatic United States of America, Connecticut, Stamford
Breitling Navitimer 8
$2,900
Verified Dealer
7
US
Rolex Datejust 126334 New Steel 41mm Automatic United States of America, New Jersey, Totowa
Rolex Datejust 41mm 2020 126334
$10,920
Verified Dealer
367
US
Ulysse Nardin Marine Chronometer Manufacture 1183-126/61 New Steel 43mm Automatic United States of America, Illinois, Northfield
TOP
Ulysse Nardin Marine Chronometer Manufacture 43 mm
$5,450
Free shipping
Verified Dealer
110
US
Omega Seamaster Planet Ocean Chronograph 232.63.46.51.01.001 Very good Rose gold 45.5mm Automatic United States of America, Wisconsin, La Crosse
Omega Seamaster Planet Ocean Chronograph Rose Gold Black...
$16,610
Free shipping
Verified Dealer
20
US
Rolex Explorer II 16570 Steel 41mm Automatic United States of America, New York, New York
TOP
Rolex Explorer II 16570 Men's Watch Original Box & Papers
$7,499
Verified Dealer
416
US
Rolex Submariner Date 126610LN Unworn Steel 41mm Automatic United States of America, Georgia, ATLANTA
TOP
Rolex Submariner Date 126610N 2020
$15,400
Free shipping
Verified Dealer
41
US
Omega Constellation Ladies 123.58.35.20.55.003 Very good Rose gold Manual winding United States of America, California, Beverly Hills
Omega Constellation Chronometer Watch
$9,500
Verified Dealer
12
US
Rolex Submariner Date 116610LN Very good Steel 40mm Automatic United States of America, California, Cerritos
Rolex Submariner Date
$13,900
Verified Dealer
37
US
Rolex Datejust II 126334 Fair Steel 41mm Automatic United States of America, New York, Brooklyn
Rolex Datejust 2 Fluted Bezel Jubilee Bracelet Slate Dial
$9,999
Verified Dealer
21
US
Rolex Submariner Date 126610LN New Steel 41mm Automatic United States of America, New Jersey, Totowa
Rolex Submariner Date 41mm 126610LN 2020
$14,449
Verified Dealer
367
US
Omega Speedmaster '57 331.12.42.51.01.002 Unworn Steel 41.5mm Automatic United States of America, Massachusetts, Boston
Omega Speedmaster '57 Stainless Steel 41.5mm 331.12.42.51.01.002
$7,700
Verified Dealer
33
US
Omega Seamaster Aqua Terra 220.10.41.21.02.001 Unworn Steel 41mm Automatic United States of America, Wisconsin, La Crosse
Omega Seamaster Aqua Terra Golf Co-axial Master Chronometer...
$4,339
Free shipping
Verified Dealer
20
US
Rolex Sea-Dweller 126600 Unworn Steel 43mm Automatic United States of America, New York, New York
Rolex Sea-Dweller Stainless Steel Red Sea-Dweller Black Index...
$15,699
Free shipping
Verified Dealer
306
US
Breitling Navitimer A24322 Very good Steel 45mm Automatic United States of America, New York, New York
TOP
Breitling Navitimer A24322 mens Watch Box Papers
$3,999
Verified Dealer
416
US
Breitling Chronomat 44 HB0110 Very good Rose gold 44mm Automatic United States of America, California, Santa Monica
TOP
Breitling Chronomat 44 18K Rose Gold Complete Set
$29,500
Verified Dealer
88
US
Omega Speedmaster 324.30.38.50.03.002 New Steel 38mm Automatic United States of America, Florida, Hollywood
TOP
Omega Speedmaster 324.30.38.50.03.002 Chronograph 38mm...
$3,785
Verified Dealer
781
US
TAG Heuer Carrera Calibre 16 CV201AK.BA0727 New Steel 41mm Automatic United States of America, California, Cerritos
TAG Heuer Carrera Calibre 16 Carrera Juan Manuel Fangio...
$4,350
Verified Dealer
37
US
Rolex Sea-Dweller 126600 New Steel 43mm Automatic United States of America, Florida, Boca Raton
Rolex Sea-Dweller 43mm Red 50th Anniversary 126600
$16,500
Verified Dealer
116
US
Rolex Datejust 126334 New Steel 41mm Automatic United States of America, New Jersey, Totowa
Rolex Datejust 41mm 2020 Blue Dial 126334
$10,899
Verified Dealer
367
US
Audemars Piguet Royal Oak Offshore Chronograph 26170ST.OO.D101CR.03 Very good Steel 42mm Automatic United States of America, New York, New York
Audemars Piguet Royal Oak Offshore 42, Stainless Steel with...
$17,250
Free shipping
Verified Dealer
25
US
Ulysse Nardin Maxi Marine Diver 8006-102-3a/91 Very good Rose gold 42.7mm Automatic United States of America, Wisconsin, La Crosse
Ulysse Nardin Maxi Marine Diver Chronograph Rose Gold 43mm
$14,232
Free shipping
Verified Dealer
20
US
Rolex Datejust 126334 Unworn Steel 41mm Automatic United States of America, New York, New York
Rolex Datejust 41 Steel White Index Dial 41MM Watch 126334
$12,599
Free shipping
Verified Dealer
306
US
Rolex Datejust 16014 Steel 36mm Automatic United States of America, New York, New York
TOP
Rolex Datejust 16014 Men's Watch
$5,499
Verified Dealer
416
US
Rolex Submariner 126619LB New White gold 41mm Automatic United States of America, New York, Smithtown
Rolex NEW OCT 2020 Rolex Submariner 41 Blue 'SMURF' 18K White...
$49,994
Free shipping
Verified Dealer
350
US
Rolex Datejust 126334 New Steel 41mm Automatic United States of America, New York, Brooklyn
Rolex Datejust 41 Fluted Bezel Jubilee Bracelet Rhodium Dial...
$11,499
Verified Dealer
21
US
Breitling Super Avenger II A1337111/G779 Unworn Steel Automatic United States of America, Massachusetts, Boston
Breitling Super Avenger II Chronograph Stainless Steel 48m...
$4,650
Verified Dealer
33
US
Rolex Sea-Dweller Deepsea 126660 New Steel 44mm Automatic United States of America, Florida, Boca Raton
Rolex Sea-Dweller Deepsea 44mm 126660-0001
$15,500
Verified Dealer
116
US
Rolex Datejust 126334 New Steel 41mm Automatic United States of America, New Jersey, Totowa
Rolex Datejust 41mm 126334 2020 Blue Jubilee
$11,399
Verified Dealer
367
US
Hublot Big Bang Unico 413.OX.4738.PR.KOB15 Unworn Rose gold 45б5mm Automatic United States of America, New York, New York
Hublot Big Bang Unico 45.5mm rose gold with retrograde...
$250,000
Free shipping
Verified Dealer
25
US
Ulysse Nardin Maxi Marine Diver 266-58-3 Good Yellow gold 40mm Automatic United States of America, Wisconsin, La Crosse
Ulysse Nardin Maxi Marine Diver Chronometer 40mm Gold White Dial
$10,497
Free shipping
Verified Dealer
20
US
Rolex Datejust 126334 Unworn Steel 41mm Automatic United States of America, New York, New York
Rolex Datejust 41 Jubilee Stainless Steel White Gold Bezel...
$12,099
Free shipping
Verified Dealer
306
US
Rolex Datejust 16238 Very good Yellow gold 36mm Automatic United States of America, New York, New York
TOP
Rolex Datejust 16238 18k Yellow Gold Blue Vignette
$15,999
Verified Dealer
416
US
Omega Seamaster Aqua Terra 220.10.43.22.03.001 Unworn Steel 43mm Automatic United States of America, Massachusetts, Boston
Omega Seamaster Aqua Terra
$8,250
Verified Dealer
129
US
Rolex Sea-Dweller Deepsea 36000 Very good 44mm Automatic United States of America, Massachusetts, Boston
Rolex Sea Dweller Deep Sea D-Blue 2018 (36000)
$15,500
Verified Dealer
628
US
Rolex Day-Date 40 228238 Very good Yellow gold 40mm Automatic United States of America, New York, Smithtown
Rolex 2018 Rolex Day-Date 40 President 18K Yellow Gold...
$34,994
Free shipping
Verified Dealer
350
US
Panerai Luminor Marina PAM 00001 Very good Steel 44mm Manual winding United States of America, Florida, Boca Raton
Panerai Luminor Marina PAM 0001 A Series Circa 1998
$17,500
Verified Dealer
116
US
Rolex Datejust 126334 New Steel 41mm Automatic United States of America, New Jersey, Totowa
Rolex Datejust 41mm 2020 Diamond Rhodium
$12,375
Verified Dealer
367
US
Audemars Piguet Royal Oak Selfwinding 15400ST.OO.1220ST.03 Unworn Steel 41mm Automatic United States of America, New York, New York
Audemars Piguet Royal Oak Selfwinding 41, Stainless Steel,...
$44,350
Free shipping
Verified Dealer
25
US
Breitling Superocean II 42 A17365D1/C915-148S Very good Steel 42mm Automatic United States of America, Wisconsin, La Crosse
Breitling Superocean II 42 Blue Dial Diver Chronometer
$2,497
Free shipping
Verified Dealer
20
US
Rolex Datejust 126334 Unworn Steel 41mm Automatic United States of America, New York, New York
Rolex Datejust 41 Stainless Steel White Roman Dial 41MM Watch...
$12,599
Free shipping
Verified Dealer
306
US
Rolex Datejust 16234 Very good Steel 36mm Automatic United States of America, New York, New York
TOP
Rolex Datejust 16234 Stainless Steel Automatic
$5,899
Verified Dealer
416
US
Rolex Submariner (No Date) 124060 Unworn Steel 41mm Automatic United States of America, California, Beverly Hills
TOP
Rolex Submariner 41 No Date - Box/Papers/Card 124060 - New...
$12,750
Free shipping
Verified Dealer
US
Omega Speedmaster Professional Moonwatch Moonphase 304.63.44.52.02.001 New Yellow gold Automatic United States of America, Florida, Hollywood
TOP
Omega Moonphase Speedmaster 304.63.44.52.02.001 Yellow Gold...
$20,985
Verified Dealer
781
US
Rolex Explorer II 16570 Very good Steel 40mm Automatic United States of America, New York, Smithtown
Rolex MINT 2001 Rolex Explorer II 16570 Stainless 40mm GMT...
$6,293
Free shipping
Verified Dealer
350
US

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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