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Chopard L.U.C 168579-3001 New Steel 42.00mm Automatic United States of America, California, San Mateo
TOP
Chopard L.U.C. GMT One Automatic Black Dial Mens Watch -...
$7,499
Free shipping
Professional dealer
3838
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...
$2,489
Free shipping
Professional dealer
3838
US
Omega Seamaster Diver 300 M 210.30.42.20.01.001 New Steel 42mm Automatic United States of America, Iowa, Des Moines
TOP
Omega Seamaster Diver 300m 42mm Steel 210.30.42.20.01.001
$4,500
Free shipping
Professional dealer
1661
US
Omega Speedmaster Racing 326.32.40.50.02.001 New Steel 40mm Automatic United States of America, California, San Mateo
TOP
Omega Speedmaster Racing Co-Axial Chronograph 40 mm Automatic...
$4,679
Free shipping
Professional dealer
3838
US
Rolex Datejust 126334 New Steel 41mm Automatic United States of America, California, Los Angeles
TOP
Rolex Datejust 41 White Roman Fluted Jubilee Box/Papers/Card...
$11,499
Free shipping
Professional dealer
138
US
Rolex Datejust 16234 Very good Steel 36mm Automatic United States of America, New York, New York
TOP
Rolex Oyster Perpetual Datejust 16234 Mens Watch
$5,399
Professional dealer
470
US
Rolex Sea-Dweller 126600 New Steel 43mm Automatic United States of America, New York, Brooklyn
TOP
Rolex Sea-Dweller UnWorn Warranty 2021 “126600“
$15,999
Professional dealer
28
US
Rolex Explorer 114270 Very good Steel 36mm Automatic United States of America, Massachusetts, Boston
Rolex Explorer I 114270 Black (36938)
$6,950
Professional dealer
676
US
Omega Seamaster Diver 300 M 210.22.42.20.01.004 Very good Steel 42mm Automatic United States of America, Florida, Coconut Creek
Omega Seamaster Diver 300M 42 MM James Bond 007 LE 210.22.42.2...
$9,995
Professional dealer
8
US
Omega OMEGA LIMITED EDITION COSMIC 18K GOLD CALENDAR AUTOMATIC WAT Good Yellow gold 35mm Automatic United States of America, California, SAN FRANCISCO
TOP
Omega Limited Edition Cosmic Full Calendar Moonphase 18K Gold
$4,000
Professional dealer
19
US
Rolex Day-Date 18248 Very good Yellow gold 36mm Automatic United States of America, California, Los Angeles
Rolex Day-Date President W/h Diamond Bezel
$17,995
Professional dealer
 
US
Rolex Datejust 126334 Unworn Steel 41mm Automatic United States of America, Florida, Miami
Rolex 126334 Datejust 41 Wimbledon Dial 2020 Stainless Steel
$13,499
Professional dealer
240
US
Rolex Datejust 126300-0015 New Steel 41mm Automatic United States of America, California, Stockton
TOP
Rolex Datejust 41mm White Dial, Roman Numerals, Smooth Bezel,...
$10,045
Free shipping
Professional dealer
 
US
Urwerk UR-210 UR-210BPT Royal Hawk Very good Platinum 53.6mm Automatic United States of America, Connecticut, Greenwich
Urwerk UR-210 BPT Royal Hawk.
$125,000
Professional dealer
19
US
Rolex Datejust 16014 Very good Steel 36mm Automatic United States of America, New York, New York
TOP
Rolex Oyster Perpetual Datejust 16014 Men's Watch
$5,399
Professional dealer
470
US
Chopard Mille Miglia 168580-3001 Very good Steel 46mm Automatic United States of America, Texas, Houston
Chopard Mille Miglia 2016 Race Edition XL 46mm Chronograph...
$5,750
Free shipping
Professional dealer
66
US
Jaeger-LeCoultre Geophysic 1958 37171 Very good Steel Automatic United States of America, Massachusetts, Boston
Jaeger-LeCoultre Geophysic 1958 SS Limited (37171)
$9,900
Professional dealer
676
US
Omega Seamaster Planet Ocean 215.30.44.21.03.001 Very good Steel 43.5mm Automatic United States of America, Florida, Coconut Creek
Omega Seamaster Blue Planet Ocean 43.5 MM Men’s Watch 215.30.4...
$4,995
Professional dealer
8
US
Chopard Superfast 168523-3001 Very good Steel 45mm Automatic United States of America, California, Upland
TOP
Chopard Superfast 45mm Classic Racing 168523-3001 Manufacture...
$3,899
Professional dealer
219
US
Omega Speedmaster Professional Moonwatch 311.63.42.30.03.001 Good Yellow gold 42mm Automatic United States of America, Texas, Houston
Omega Speedmaster Apollo XVII Ltd Edition 311.63.42.30.03.001...
$24,800
Professional dealer
71
US
Rolex Datejust 126334 Unworn White gold 41mm Automatic United States of America, Florida, Miami
Rolex 126334 Datejust 41 Dark Rhodium Dial 2020 Stainless Steel
$12,999
Professional dealer
240
US
Omega Constellation 168.005 Fair Gold/Steel 34.0mm Automatic United States of America, California, Stockton
TOP
Omega Constellation Cal. 564
$1,636
Free shipping
Professional dealer
 
US
Omega Seamaster Aqua Terra 231.10.43.22.01.001 New Steel 43mm Automatic United States of America, Connecticut, Greenwich
Omega Seamaster Aqua Terra Gmt
$6,800
Professional dealer
19
US
Rolex Datejust 16014 Very good Steel 36mm Automatic United States of America, New York, New York
TOP
Rolex Datejust 16014 Mens Watch
$5,199
Professional dealer
470
US
Rolex Datejust 126334 New Steel 41mm Automatic United States of America, New Jersey, Woodbridge
Rolex Datejust 41mm Silver Dial UNWORN 2020 New Style Card 126334
$12,300
Professional dealer
49
US
Omega Speedmaster '57 36679 Very good Yellow gold Automatic United States of America, Massachusetts, Boston
Omega Speedmaster '57 Co-Axial 18k White Dial (36679)
$15,900
Professional dealer
676
US
Rolex Submariner Date 126610LN New Steel 41mm Automatic United States of America, Florida, Orlando
Rolex 2021 Submariner Ceramic Date 126610 LN 41MM NEW
$14,245
Professional dealer
491
US
Audemars Piguet Royal Oak Offshore Chronograph 26470ST.OO.A027CA.01 Very good Steel 42mm Automatic United States of America, South Carolina, murrells inlet
TOP
Audemars Piguet Royal Oak Offshore Chronograph
$18,200
Private Seller
 
US
Hublot Big Bang 44 mm Good Ceramic 44mm Automatic United States of America, Texas, Houston
Hublot Big Bang Limited Edition Kronometry Boutique K99 Orange...
$9,875
Professional dealer
71
US
Rolex Submariner Date 126610LN Unworn Steel 41mm Automatic United States of America, Florida, Miami
Rolex Submariner Date 126610LN 41mm Stainless Steel Mens Watch...
$14,995
Professional dealer
240
US
Breitling Superocean Heritage 46 A17320 Very good Steel 46mm Automatic United States of America, California, Stockton
TOP
Breitling Superocean Heritage 46
$2,900
Free shipping
Professional dealer
 
US
Omega Seamaster 300 233.60.41.21.03.001 New Titanium 41mm Automatic United States of America, Connecticut, Greenwich
Omega Seamaster 300
$12,500
Professional dealer
19
US
Rolex Lady-Datejust 69173 Very good Steel 26mm Automatic United States of America, New York, New York
TOP
Rolex Datejust 69173 Ladies Watch
$4,499
Professional dealer
470
US
Rolex Submariner Date 126610LN Very good Steel 41mm Automatic United States of America, Florida, NAPLES
Rolex Submariner Date 41mm Full Set
$13,522
Free shipping
Professional dealer
 
US
Rolex Datejust 36329 Very good 36mm Automatic United States of America, Massachusetts, Boston
Rolex Datejust Jubilee Tapestry Dial 18K / SS FULL SET (36329)
$6,950
Professional dealer
676
US
Rolex Datejust 126334 New Steel 41mm Automatic United States of America, New Jersey, Totowa
Rolex Datejust 41mm 126334 2021 Rhodium Stick Dial
$13,399
Professional dealer
419
US
TAG Heuer Monza CR5110 Very good Steel 38mm Automatic United States of America, Florida, Pembroke Pines
TOP
TAG Heuer Monza chronograph Calibre 36 Zenith El Primero ...
$3,370
Professional dealer
60
US
Breitling Bentley Motors A25362 Good Steel 49mm Automatic United States of America, Texas, Houston
Breitling Bentley Motors A25362 S/s 49mm Chronograph W/brown Dial
$4,950
Professional dealer
71
US
Rolex Submariner (No Date) 124060 Unworn Steel 41mm Automatic United States of America, Florida, Miami
Rolex Submariner 124060 41mm No Date Stainless Steel IN STOCK
$13,995
Professional dealer
240
US
Tudor Black Bay Fifty-Eight M79030B-0002 Very good Steel 39mm Automatic United States of America, California, Stockton
TOP
Tudor Black Bay Fifty-Eight Navy Blue 39 MM
$4,100
Free shipping
Professional dealer
 
US
Omega De Ville Co-Axial 431.53.42.51.03.001 Unworn Rose gold 42mm Automatic United States of America, Connecticut, Greenwich
Omega De Ville Co-Axial
$21,750
Professional dealer
19
US
Rolex Day-Date 18346 Very good Platinum 36mm Automatic United States of America, New York, New York
TOP
Rolex Day-Date President 18346 Platinum Diamond Mens Watch
$24,999
Professional dealer
470
US
Formex Very good Steel 43mm Automatic United States of America, Massachusetts, Buzzards Bay
TOP
Formex Essence Automatic Chronometer Dégradé
$895
Private Seller
 
US
Omega Seamaster Aqua Terra 37159 Very good Steel 38mm Automatic United States of America, Massachusetts, Boston
Omega Seamaster Aqua Terra Co-Axial Master Silver Dial SS (37159)
$3,950
Professional dealer
676
US
Rolex Datejust 126334 Very good Steel 41mm Automatic United States of America, New Jersey, Totowa
Rolex Datejust 41mm Blue Index Jubilee 126334 Complete Box & Card
$11,199
Professional dealer
419
US
Rolex Oyster Perpetual 34 Very good Steel 34mm Automatic United States of America, California, Beverly Hills
Rolex Mens Rolex Oyster perpetual 1002 34mm Automatic, c.1960s...
$3,800
Free shipping
Professional dealer
775
US
Hublot Big Bang Aero Bang 310.KX.1140.RX Good Titanium 44mm Automatic United States of America, Texas, Houston
Hublot Big Bang Aero Bang 44mm Limited 999 Tungsten Auto...
$10,475
Professional dealer
71
US
Rolex Sea-Dweller 126600 Unworn Steel 43mm Automatic United States of America, Florida, Miami
Rolex 126600 UNWORN 2020 Sea-Dweller RED Stainless Steel Men’s
$15,795
Professional dealer
240
US
Breitling Avenger II GMT A32390111C1A1 Very good Steel 43mm Automatic United States of America, California, Stockton
TOP
Breitling Avenger II GMT Blue Dial A32390
$2,800
Free shipping
Professional dealer
 
US
Omega Speedmaster Broad Arrow 3882.31.37 Very good Steel 44.25mm Automatic United States of America, Connecticut, Greenwich
Omega Speedmaster Broad Arrow Rattrapante
$6,750
Professional dealer
19
US
Rolex Datejust 16233 Very good Steel 36mm Automatic United States of America, New York, New York
TOP
Rolex Datejust 16233 Mens Watch
$6,899
Professional dealer
470
US
Omega Seamaster Diver 300 M 210.32.42.20.06.001 Unworn Steel 42mm Automatic United States of America, Indiana, Valparaiso
TOP
Omega Seamaster Professional 300M Gray/Blue Chronometer -
$3,800
Private Seller
 
US
Rolex GMT-Master II 126710 Very good Steel 40mm Automatic United States of America, Massachusetts, Boston
Rolex GMT Master II 126710 Ceramic "Batman" SS / Jubilee 2020...
$18,900
Professional dealer
676
US
Rolex Datejust 126334 New Steel 41mm Automatic United States of America, New Jersey, Totowa
Rolex Datejust 41mm 2021 Rhodium Dial 126334
$11,249
Professional dealer
419
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
Professional dealer
327
US
Omega Seamaster Aqua Terra 231.10.43.22.03.001 Good Steel 43mm Automatic United States of America, Texas, Houston
Omega Seamaster Aqua Terra 150m Co-axial Gmt 43 Mm Automatic Blue
$5,450
Professional dealer
71
US
Rolex Submariner Date 16610 T Very good Steel 40mm Automatic United States of America, California, Pleasant Hill
Rolex Submariner Date, Ref 16610 T, Men’s, Stainless Steel,...
$9,625
Free shipping
Professional dealer
214
US
TAG Heuer Grand Carrera WAV511B.FC6230 Very good Steel 40.3mm Automatic United States of America, California, Stockton
TOP
TAG Heuer Grand Carrera
$2,000
Free shipping
Professional dealer
 
US
Omega Constellation Men 123.20.38.21.01.002 New Steel 38mm Automatic United States of America, Connecticut, Greenwich
Omega Constellation Co-axial
$7,600
Professional dealer
19
US
Rolex Datejust 16234 Very good Steel 36mm Automatic United States of America, New York, New York
TOP
Rolex Datejust 16234 Tapestry Mens Watch
$5,799
Professional dealer
470
US
Omega Seamaster Aqua Terra 220.12.38.20.03.001 Unworn Steel 38mm Automatic United States of America, Florida, Sorrento
TOP
Omega Seamaster Aqua Terra
$3,895
Private Seller
 
US
Ulysse Nardin Marine Chronometer Manufacture 1186-122-8M/42 Very good Rose gold 45mm Automatic United States of America, Wisconsin, La Crosse
TOP
Ulysse Nardin Marine Chronometer Manufacture Rose Gold 45mm...
$22,997
Free shipping
Professional dealer
25
US
Rolex Submariner Date 126610LN New Steel 41mm Automatic United States of America, New Jersey, Totowa
Rolex Submariner Date 41mm 126610LN 2021
$14,949
Professional dealer
419
US
Rolex Datejust 126334 Unworn Steel 41mm Automatic United States of America, New York, New York
Rolex Datejust 41 Stainless Steel and White Gold White Index...
$12,599
Free shipping
Professional dealer
327
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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