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Omega De Ville Prestige 424.10.33.20.55.004 New Steel 32.7mm Automatic United States of America, California, San Mateo
TOP
Omega De Ville Prestige Co‑Axial 32.7 mm Orbis Automatic White...
$3,469
Free shipping
Verified Dealer
1869
US
Omega De Ville Prestige 424.13.40.20.01.001 New Steel 39.5mm Automatic United States of America, California, San Mateo
TOP
Omega De Ville Prestige Co‑Axial 39.5 mm Automatic Black Dial...
$2,369
Free shipping
Verified Dealer
1869
US
Omega Seamaster Planet Ocean 522.33.38.20.04.001 New Steel 37.5mm Automatic United States of America, California, San Mateo
TOP
Omega Seamaster Planet Ocean 600M Co-Axial 37.5MM Olympic...
$4,519
Free shipping
Verified Dealer
1869
US
Omega Seamaster PloProf 227.90.55.21.01.001 New Titanium 55mm Automatic United States of America, California, San Mateo
TOP
Omega Seamaster Ploprof 1200M Co-Axial Master Chronometer...
$8,199
Free shipping
Verified Dealer
1869
US
Rolex GMT-Master II 116710LN Very good Steel 40mm Automatic
Rolex GMT-Master II 116710LN
$11,873
Free shipping
Verified Dealer
487
UK
Omega Seamaster Planet Ocean 215.92.44.21.99.001 Very good Titanium 43.5mm Automatic United States of America, Georgia, ATLANTA
TOP
Omega Seamaster Planet Ocean 43.5mm Grey/Orange bezel Card Box
$6,300
Free shipping
Verified Dealer
21
US
Omega Seamaster Aqua Terra 220.10.38.20.02.001 New Steel 38mm Automatic United States of America, Georgia, Alpharetta
TOP
Omega Seamaster Aqua Terra
$3,850
Free shipping
Verified Dealer
192
US
Rolex Datejust 126334 New Gold/Steel 41mm Automatic United States of America, New York, NEW YORK
TOP
Rolex Datejust 41mm 126334 Stainless Steel Jubilee Blue Roman...
$10,800
Free shipping
Verified Dealer
96
US
Rolex Oyster Perpetual Lady Date 76094 Very good Steel 24mm Automatic United States of America, Georgia, Atlanta
Rolex Oyster Perpetual Non-date Steel White Gold Ladies Watch...
$2,990
Free shipping
Verified Dealer
425
US
Omega Seamaster 300 233.32.41.21.01.001 Very good Steel 41mm Automatic United States of America, Georgia, Atlanta
TOP
Omega Seamaster 300 233.32.41.21.01.001 Watch with Stainless...
$9,500
Free shipping
Verified Dealer
559
US
Omega Speedmaster Racing 329.32.44.51.01.001 Very good Steel 44.2mm Automatic United States of America, Texas, Austin
Omega Speedmaster Racing 329.32.44.51.01.001
$5,300
Verified Dealer
15
US
Omega Seamaster Aqua Terra 231.13.39.21.01.001 Good Steel 38.5mm Automatic United States of America, Florida, Sarasota
TOP
Omega Aqua Terra Automatic Chronometer 38.5mm Men's Watch...
$3,008
Free shipping
Verified Dealer
530
US
Rolex Datejust 126334 Unworn Steel 41mm Automatic United States of America, New York, New York
Rolex Datejust 41 Steel Black Index Dial President Watch 126334
$10,999
Free shipping
Verified Dealer
222
US
Breitling Chronomat Evolution C13356 Very good Gold/Steel 44mm Automatic
Breitling Chronomat Evolution Chrono 44mm Full Set B+P Mint
$4,560
Verified Dealer
135
DE
Omega Seamaster Planet Ocean 215.30.44.21.01.002 Very good Steel 43.5mm Automatic United States of America, California, Sunnyvale
TOP
Omega Seamaster Planet Ocean
$4,500
Free shipping
Verified Dealer
85
US
Omega Seamaster Aqua Terra 220.10.41.21.02.001 Unworn Steel 41mm Automatic United States of America, Georgia, Alpharetta
TOP
Omega Seamaster Aqua Terra
$4,069
Free shipping
Verified Dealer
192
US
Rolex Submariner Date 116613LB Unworn Gold/Steel 40mm Automatic
Rolex Submariner Date LC100 Stahl/GG 116613LB Fullset
$16,294
Verified Dealer
74
DE
Rolex Day-Date Oysterquartz 9018 Very good Yellow gold 35mm Quartz United States of America, Massachusetts, Boston
Rolex 19018 OysterQuartz Day Date 18K Yellow Gold / Champaigne...
$10,900
Verified Dealer
459
US
Omega Seamaster Planet Ocean 232.63.42.21.01.001 Very good Rose gold 42mm Automatic United States of America, Georgia, Atlanta
TOP
Omega Seamaster Planet Ocean 232.63.42.21.01.001 Watch with...
$13,080
Free shipping
Verified Dealer
559
US
Tudor Pelagos 25600TN Very good Titanium 42mm Automatic United States of America, New York, New York
TOP
Tudor Pelagos 25600TN Titanium Watch
$3,599
Free shipping
Verified Dealer
316
US
Omega Speedmaster '57 331.22.42.51.01.001 New 41.5mm Automatic United States of America, Florida, Sarasota
TOP
Omega Speedmaster '57 Omega Co?axial Chronograph 41.5MM 18k...
$6,392
Free shipping
Verified Dealer
530
US
Rolex Submariner Date 16610T Very good Steel 40mm Automatic United States of America, New York, New York
Rolex Submariner 50th Anniversary Kermit Ceramic Watch 16610T
$14,999
Free shipping
Verified Dealer
222
US
Omega Speedmaster 310.20.42.50.01.001 New Steel 42mm Manual winding United States of America, California, Newport Beach
Omega Speedmaster Apollo 11 50th Anniversary 310.20.42.50.01.001
$11,996
Free shipping
Verified Dealer
23
US
Rolex Sea-Dweller 126600 Very good Steel 43mm Automatic United States of America, California, Sunnyvale
TOP
Rolex Sea-Dweller
$13,800
Free shipping
Verified Dealer
85
US
Omega Seamaster Aqua Terra 220.10.41.21.01.001 Unworn Steel 41mm Automatic United States of America, Georgia, Alpharetta
TOP
Omega Seamaster Aqua Terra
$4,049
Free shipping
Verified Dealer
192
US
Omega Seamaster Aqua Terra 220.12.41.21.03.002 New Steel 41mm Automatic United States of America, California, San Mateo
Omega Seamaster Aqua Terra 150M Co‑Axial Master Chronometer 41 mm
$3,939
Free shipping
Verified Dealer
1869
US
Rolex Submariner Date 116610LV Very good Steel 40mm Automatic United States of America, Massachusetts, Boston
Rolex 116610LV OMAN KHANJAR Submariner Green Ceramic "OMAN...
$27,500
Verified Dealer
459
US
Rolex Cellini Dual Time 50529 Very good White gold 39mm Automatic United States of America, Georgia, Atlanta
TOP
Rolex Cellini Dual Time 50529 Watch with Leather Bracelet and...
$12,200
Free shipping
Verified Dealer
559
US
Rolex Lady-Datejust 78274 Very good Steel 26mm Automatic United States of America, New York, New York
TOP
Rolex Oyster Perpetual Datejust 78274 Watch
$5,199
Free shipping
Verified Dealer
316
US
Omega Speedmaster Professional Moonwatch 311.93.44.51.03.001 Good Titanium 44.2mm Automatic United States of America, Florida, Sarasota
TOP
Omega Speedmaster Moonwatch Blue Dial Chronograph Men's Watch...
$6,580
Free shipping
Verified Dealer
530
US
Rolex Datejust 126334 Very good Steel 41mm Automatic United States of America, New York, New York
Rolex Datejust 41 Stainless-Steel Black Diamond Dial Watch 126334
$10,999
Free shipping
Verified Dealer
222
US
Omega Speedmaster Professional Moonwatch 311.93.44.51.03.001 Very good Titanium 44.2mm Automatic United States of America, California, Newport Beach
Omega Speedmaster Titanium Co-Axial Chronograph Moonwatch
$7,900
Free shipping
Verified Dealer
23
US
Omega Seamaster Planet Ocean 215.30.44.21.03.001 New Steel 43.5mm Automatic United States of America, Massachusetts, Milford
Omega Seamaster Planet Ocean
$4,750
Verified Dealer
58
US
Omega Seamaster Aqua Terra 23110432201001 Very good Steel 43mm Automatic
Omega Seamaster Co Axial Chronometer GMT
$4,682
Free shipping
Verified Dealer
849
DE
Rolex Daytona 116500LN Unworn Steel 40mm Automatic
Rolex Daytona 116500LN
$27,704
Free shipping
Verified Dealer
487
UK
Rolex Explorer 114270 Very good Steel 36mm Automatic United States of America, Massachusetts, Boston
Rolex 114270 Explorer I 114270 36MM (33896)
$6,950
Verified Dealer
459
US
Omega Seamaster Planet Ocean 215.33.44.22.01.001 Very good Steel 43.5mm Automatic United States of America, Georgia, Atlanta
TOP
Omega Seamaster Planet Ocean 215.33.44.22.01.001 Watch with...
$5,400
Free shipping
Verified Dealer
559
US
Breitling Avenger II A13381 Very good Steel 43mm Automatic United States of America, New York, New York
TOP
Breitling Avenger II A13381 Mens Watch
$2,999
Free shipping
Verified Dealer
316
US
Ulysse Nardin Marine Chronometer Manufacture 1183-126/61 New Steel 43mm Automatic United States of America, Florida, Sarasota
TOP
Ulysse Nardin Marine Chronometer Black Alligator Leather Men's...
$4,418
Free shipping
Verified Dealer
530
US
Panerai Special Editions PAM00127 Very good Steel 47mm Automatic United States of America, New York, New York
Panerai Luminor 1950 Steel Small Seconds 47MM Watch PAM00127
$18,499
Free shipping
Verified Dealer
222
US
Omega Seamaster Planet Ocean 215.30.44.21.01.002 Very good Steel 43.5mm Automatic United States of America, California, Sunnyvale
TOP
Omega Seamaster Planet Ocean
$4,500
Free shipping
Verified Dealer
85
US
Omega Seamaster Planet Ocean Chronograph 2218.50.00 Very good Steel 45.5mm Automatic United States of America, Texas, Dallas
Omega Seamaster Planet Ocean 2218.50
$4,935
Verified Dealer
25
US
Breitling Navitimer 8 A45330101C1X2 New Steel 41mm Automatic United States of America, Massachusetts, Milford
Breitling Navitimer 8
$2,750
Verified Dealer
58
US
Rolex GMT-Master II 126710BLNR Unworn Steel 40mm Automatic
Rolex GMT-Master II Batman 126710BLNR
$17,150
Free shipping
Verified Dealer
487
UK
Rolex GMT-Master II 16710 Very good Steel 40mm Automatic United States of America, Massachusetts, Boston
Rolex 16710 T GMT Master II SS Red / Black Coke FULL SET NICE...
$16,500
Verified Dealer
459
US
Omega Constellation Ladies 123.57.35.20.55.005 Very good White gold 35mm Automatic United States of America, Georgia, Atlanta
TOP
Omega Constellation 123.57.35.20.55.005 Watch with Rubber...
$10,500
Free shipping
Verified Dealer
559
US
Breitling B-2 K42362 Very good Yellow gold 44mm Automatic United States of America, New York, New York
TOP
Breitling Professional B2 K42362 18K Mens Watch
$10,199
Free shipping
Verified Dealer
316
US
Omega Constellation Double Eagle 121.92.41.50.01.001 New Titanium 41mm Automatic United States of America, Florida, Sarasota
TOP
Omega Constellation Double Eagle Mission Hills World Cup Men's...
$3,224
Free shipping
Verified Dealer
530
US
Rolex Datejust 126334 Unworn Steel 41mm Automatic United States of America, New York, New York
Rolex Datejust 41 Steel White MOP Diamond Dial 41MM Watch 126334
$15,499
Free shipping
Verified Dealer
222
US
Rolex Lady-Datejust 178273 Very good Gold/Steel 31mm Automatic
Rolex Datejust Oyster Perpetual 31 mm Steel Yellow Gold Diamond
$9,144
Free shipping
Verified Dealer
199
RO
Rolex Explorer II 16570 T Very good Steel 42mm Automatic United States of America, New York, Hartsdale
Rolex Explorer II
$6,495
Verified Dealer
375
US
Rolex Datejust 126334 Very good Steel 41mm Automatic United States of America, Tennesse, Nashville
Rolex Datejust
$9,125
Free shipping
Verified Dealer
191
US
Omega Seamaster Diver 300 M 212.30.41.20.03.001 Very good Steel 41mm Automatic United States of America, California, Irvine
Omega Seamaster Diver 300m Co-Axial Stainless Steel
$3,495
Verified Dealer
 
US
Rolex GMT-Master II 126715 New Rose gold 40mm Automatic United States of America, Massachusetts, Boston
Rolex 126715 CHNR GMT Master II 18K Everose Ceramic Root Beer...
$35,500
Verified Dealer
459
US
Breitling Chronomat CB0110 Very good Steel 44mm Automatic United States of America, Georgia, Atlanta
TOP
Breitling Chronomat 01 CB0110 Watch with 18k Rose Gold,...
$7,000
Free shipping
Verified Dealer
559
US
Breitling Galactic C49350 Very good Steel 41mm Automatic United States of America, New York, New York
TOP
Breitling Galactic C49350 MOP Dial Box Papers
$4,799
Free shipping
Verified Dealer
316
US
Zenith El Primero 03.0520.4010/21.R511 New Steel 44mm Automatic United States of America, Florida, Sarasota
TOP
Zenith Grande Class Grande Date 44mm Chronograph Automatic...
$2,961
Free shipping
Verified Dealer
530
US
Rolex Sea-Dweller 126600 Unworn Steel 43mm Automatic United States of America, New York, New York
Rolex Sea-Dweller Stainless-Steel Red Black Dial 43MM Watch...
$15,999
Free shipping
Verified Dealer
222
US
Breitling Chronomat Colt A17313101G1X1 Unworn Steel 41mm Automatic United States of America, Ohio, Mason
Breitling Chronomat Colt 41mm Steel Silver A17313101G1X1 (NEW)
$2,099
Verified Dealer
742
US
Omega Seamaster Planet Ocean Good 5mm United States of America, Georgia, ATLANTA
Omega SeaMaster Planet Ocean 600M CO‑AXIAL 39.5MM Blue Dial...
$4,918
Free shipping
Verified Dealer
54
US
Omega Speedmaster Professional Moonwatch 310.20.42.50.01.001 Unworn Steel 42mm Manual winding United States of America, Tennesse, Nashville
Omega Speedmaster Professional Moonwatch
$11,650
Free shipping
Verified Dealer
191
US
Omega Constellation 14381 61 SC Good Gold/Steel United States of America, New York, New York
Omega Constellation
$1,300
Free shipping
Verified Dealer
23
US
Rolex Explorer 1016 Very good Steel Automatic United States of America, Massachusetts, Boston
Rolex 1016 Vintage Explorer I "Frog Foot Coronet" Logo (33752)
$17,900
Verified Dealer
459
US
Omega Globemaster 130.23.39.21.03.001 Very good Steel 39mm Automatic United States of America, Georgia, Atlanta
TOP
Omega Constellation Globemaster 130.23.39.21.03.001 Watch with...
$6,700
Free shipping
Verified Dealer
559
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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