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Omega Seamaster Aqua Terra 220.12.41.21.02.001 New Steel 41mm Automatic United States of America, California, San Mateo
TOP
Omega Seamaster Aqua Terra 150M Co-Axial Master Chronometer...
$4,739
Free shipping
Professional dealer
3659
US
Omega De Ville Prestige 424.13.40.20.03.003 New Steel 39.5mm Automatic United States of America, California, San Mateo
TOP
Omega De Ville Prestige Co-Axial 39.5 mm Automatic Blue Dial...
$3,339
Free shipping
Professional dealer
3659
US
Omega Seamaster PloProf 224.32.55.21.04.001 New Steel 55mm Automatic United States of America, California, Burlingame
TOP
Omega Seamaster Ploprof 1200M Co-Axial 55 x 48 mm Automatic...
$5,999
Free shipping
Professional dealer
3659
US
Omega Seamaster 215.32.43.21.04.001 New Steel 43.5mm Automatic United States of America, California, Burlingame
TOP
Omega Seamaster Planet Ocean 600M Co-axial Master Chronometer...
$7,499
Free shipping
Professional dealer
3659
US
Omega Seamaster Aqua Terra 231.10.42.21.01.003 Very good Steel 41.5mm Automatic United States of America, California, Pasadena
TOP
Omega Seamaster Aqua Terra 41.5mm Automatic
$3,242
Professional dealer
40
US
Rolex Datejust 126334 New Steel 41mm Automatic United States of America, California, Los Angeles
TOP
Rolex Datejust 41 Wimbledon Gray Roman Fluted Jubilee New
$12,249
Free shipping
Professional dealer
125
US
Omega Seamaster Diver 300 M 210.30.42.20.03.001 New Steel 42mm Automatic United States of America, Virginia, Williamsburg
TOP
Omega Seamaster 300M - 42mm - Blue Wave Dial - Omega 5yr Warranty
$4,395
Professional dealer
534
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
47
US
Rolex Datejust 126334 Very good Steel 41mm Automatic United States of America, California, Santa Monica
TOP
Rolex Datejust 41 Blue Dial
$11,995
Professional dealer
126
US
Rolex Submariner Date 126610LN New Steel 41mm Automatic United States of America, California, Newport Beach
Rolex Submariner Date 126610LN 41mm
$13,990
Free shipping
Professional dealer
33
US
Omega Seamaster Very good Steel 36.2mm Automatic United States of America, Texas, Houston
Omega Seamaster 2551.80 Blue Automatic 36mm Watch
$1,749
Professional dealer
72
US
Carl F. Bucherer Patravi ES25036085 Very good Rose gold 39mm Automatic United States of America, New York, New York
TOP
Carl F. Bucherer Carl F. Patravi T-Graph Rose Gold Black Dial...
$12,450
Free shipping
Professional dealer
144
US
Breitling Galactic Unitime WB3510U4-BD94-435X New Steel 44mm Automatic United States of America, California, Moorpark
TOP
Breitling Galactic Unitime Men's Watch WB3510U4/BD94-435X
$3,075
Free shipping
Professional dealer
534
US
Rolex Submariner (No Date) 124060 New Steel 41mm Automatic United States of America, New York, New York
Rolex Submariner No Date 41mm 124060 2020 NEW
$12,850
Free shipping
Professional dealer
310
US
Rolex Datejust 126334 New Steel 41mm Automatic United States of America, California, Los Angeles
TOP
Rolex Datejust 41 Silver Index Fluted Jubilee New Card/Box/Pap...
$10,999
Free shipping
Professional dealer
125
US
Rolex Sea-Dweller 126600 New Steel 43mm Automatic United States of America, New Jersey, Oradell
TOP
Rolex SeaDweller 43mm SD43 Red 126600
$15,450
Professional dealer
534
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...
$25,985
Professional dealer
801
US
Rolex GMT-Master II 16710T Very good Steel 40mm Automatic United States of America, Florida, Coral Gables
Rolex GMT-Master II Pepsi - Rare SWISS only dial - Circa 1999
$11,989
Professional dealer
84
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
Professional dealer
33
US
Rolex Submariner Date 126613LB New Gold/Steel 41mm Automatic United States of America, Texas, Houston
Rolex Submariner 41mm 126613 Blue W/ Box & Papers
$18,749
Professional dealer
72
US
Chopard Mille Miglia 168565-3001 New Steel 43mm Automatic United States of America, Florida, Coconut Grove
Chopard Mille Miglia GTS-Black Rubber with Power Reserve...
$4,968
Professional dealer
9
US
Rolex Day-Date 36 118235F Very good Rose gold 36mm Automatic United States of America, Florida, Boca Raton
Rolex Day-Date
$23,500
Professional dealer
 
US
Rolex Datejust 126334 New Steel 41mm Automatic United States of America, New York, New York
Rolex Datejust 41mm Fluted Wimbledon Dial Oyster 126334 Unworn
$11,500
Free shipping
Professional dealer
310
US
Rolex Datejust 126334 New Steel 41mm Automatic United States of America, California, Los Angeles
TOP
Rolex Datejust 41 Silver Index Fluted Jubilee 2021 New...
$11,250
Free shipping
Professional dealer
125
US
Rolex Datejust 126334 New Steel 41mm Automatic United States of America, New Jersey, Totowa
Rolex Datejust 41mm 2020 126334
$10,920
Professional dealer
403
US
Rolex Datejust 126334 Good Steel 41mm Automatic United States of America, Florida, Miami
Rolex Datejust 41mm Silver Dial 126334 Oyster Dic 2019
$10,350
Professional dealer
 
US
Girard Perregaux Ferrari 9020 SPLIT SECOND FOUDROYANTE SERVICE 09.2018 Very good Platinum 40mm Automatic
TOP
Girard Perregaux FERRARI CHRONOGRAPH RATTRAPANTE AUTOMATIC...
$24,840
Professional dealer
631
DE
Rolex Datejust II 126334 New Steel 41mm Automatic United States of America, New York, New York
Rolex Datejust II 18K Gold Bezel Steel /Blue Dial 40mm 126334
$11,500
Free shipping
Professional dealer
11
US
Rolex Datejust 126334 New Steel 41mm Automatic United States of America, Texas, Houston
Rolex Datejust 126334 Silver Index 41mm Oyster Steel & 18k...
$10,249
Professional dealer
72
US
Rolex Datejust 126334 New Steel 41mm Automatic United States of America, Iowa, Des Moines
Rolex Datejust 41mm Black Dial Fluted Bezel Oyster Bracelet...
$11,800
Free shipping
Professional dealer
1562
US
Omega Seamaster Diver 300 M 210.30.42.20.03.001 Unworn Steel 42mm Automatic United States of America, Georgia, ATLANTA
Omega Seamaster Diver 300 M 42mm 210.30.42.20.03.001
$5,150
Free shipping
Professional dealer
50
US
Rolex Datejust 126334 New Steel 41mm Automatic United States of America, New York, New York
Rolex Datejust 41mm 126334 Stainless Steel Jubilee Blue Roman...
$11,650
Free shipping
Professional dealer
310
US
Rolex Datejust 126334 New Steel 41mm Automatic United States of America, California, Los Angeles
TOP
Rolex Datejust 41 White Index Fluted Oyster 2021 New Card/Box/...
$10,499
Free shipping
Professional dealer
125
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
403
US
Breitling Chronomat Fair 39mm United States of America, California, Los Angeles
Breitling 18kt Gold Chronomat 81950 Rouleaux “Bullet” Bracelet
$12,000
Free shipping
Professional dealer
37
US
Chopard Mille Miglia 161296-5001 New Rose gold 43mm Automatic United States of America, Florida, Coconut Grove
Chopard Mille Miglia Black Dial Rubber Strap 18 karat Rose...
$12,999
Professional dealer
9
US
Rolex GMT-Master II 126715CHNR Unworn Rose gold Automatic United States of America, California, San Francisco
TOP
Rolex GMT-Master II new from San Francisco
$38,000
Private Seller
 
US
Rolex Datejust 126334 Very good Steel 41mm Automatic United States of America, Texas, Houston
Rolex Datejust 126334 Blue 41mm Jubilee W/ Box & Papers
$11,249
Professional dealer
72
US
Omega Speedmaster 310.20.42.50.01.001 New Steel 42mm Manual winding United States of America, Iowa, Des Moines
Omega Speedmaster Apollo 11 50th Anniversary 310.20.42.50.01.001
$14,500
Free shipping
Professional dealer
1562
US
Omega Seamaster Planet Ocean 2201.50.00 Very good Steel 42mm Automatic United States of America, Georgia, ATLANTA
Omega Seamaster Planet Ocean 2201.50.00
$4,420
Free shipping
Professional dealer
50
US
Rolex Datejust 126334 New Steel 41mm Automatic United States of America, New York, New York
Rolex Datejust Black stick Dial Jubilee 126334
$12,099
Free shipping
Professional dealer
310
US
Rolex Datejust 1601 Fair Gold/Steel 36mm Automatic United States of America, Florida, Boca Raton
Rolex Oyster Perpetual Datejust
$5,150
Professional dealer
 
US
Rolex Submariner Date 126610LN New Steel 41mm Automatic United States of America, New Jersey, Totowa
Rolex Submariner Date 41mm 126610LN 2020
$14,249
Professional dealer
403
US
Omega Constellation Quartz Very good Steel 35.5mm Quartz United States of America, California, Los Angeles
Omega Constellation Manhattan Vintage Quartz
$900
Free shipping
Professional dealer
37
US
Tudor Heritage Advisor m79620TC-0002 New Steel 42mm Automatic United States of America, Florida, Coconut Grove
Tudor Heritage Advisor Men's Swiss Watch
$5,199
Professional dealer
9
US
Omega Seamaster Diver 300 M 212.30.41.20.01.003 Good Steel 41mm Automatic United States of America, New York, Ardsley
TOP
Omega Seamaster Diver 300 M
$3,299
Private Seller
 
US
Rolex Datejust 126334 New Steel 41mm Automatic United States of America, Texas, Houston
Rolex Datejust 126334 Blue Roman 41mm Jubilee W/ Rolex...
$12,075
Professional dealer
72
US
Omega Speedmaster Professional Moonwatch 311.92.44.51.01.005 New Ceramic Automatic United States of America, Iowa, Des Moines
Omega Speedmaster Dark Side of The Moon 44mm 311.92.44.51.01.005
$9,800
Free shipping
Professional dealer
1562
US
Omega Seamaster Diver 300 M 212.30.41.20.03.001 Very good Steel 41mm Automatic United States of America, Georgia, ATLANTA
Omega Seamaster Diver 300m 212.30.41.20.03.001
$4,400
Free shipping
Professional dealer
50
US
Rolex Sea-Dweller 126600 New Steel 43mm Automatic United States of America, New York, New York
Rolex Sea-Dweller 50th Year Anniversary 126600
$14,720
Free shipping
Professional dealer
310
US
Panerai Luminor Submersible PAM 00683 Unworn Steel 42mm Automatic United States of America, Illinois, Roselle
TOP
Panerai Luminor Submersible
$7,700
Private Seller
 
US
Rolex Datejust 126334 Very good Steel 41mm Automatic United States of America, Massachusetts, Mansfield
TOP
Rolex Datejust
$10,900
Private Seller
 
US
Breitling Superocean 42 A1736402/BA28 Good Steel 42mm Automatic United States of America, Rhode Island, West Kingston
TOP
Breitling Superocean 42
$1,800
Private Seller
 
US
Chopard Mille Miglia 158566-3001 New Steel 43mm Automatic United States of America, Florida, Coconut Grove
Chopard Mille Miglia Gts Power Control
$5,099
Professional dealer
9
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
403
US
Rolex Datejust 126334 New Steel 41mm Automatic United States of America, Texas, Houston
Rolex Datejust 126334 White Roman 41mm Jubilee W/ Box &...
$12,075
Professional dealer
72
US
Omega Seamaster Diver 300 M 210.22.42.20.01.002 New Gold/Steel 42mm Automatic United States of America, Iowa, Des Moines
Omega Seamaster Diver 300m Rose Gold 42mm 210.22.42.20.01.002
$5,750
Free shipping
Professional dealer
1562
US
Rolex Oyster Perpetual Date 1505 Very good Gold/Steel 34mm Automatic
TOP
Rolex Oyster Perpetual Date 1505 Two Tone 1978
$5,716
Free shipping
Professional dealer
141
DE
Rolex Submariner Date 126610LN New Steel 41mm Automatic United States of America, New York, New York
Rolex Submariner Date NEW 126610LN 2020 Edition
$14,400
Free shipping
Professional dealer
310
US
Omega Speedmaster Professional Moonwatch 311.92.44.51.99.001 Very good Ceramic 44.25mm Automatic United States of America, New York, New York
TOP
Omega Speedmaster Grey Side of The Moon "Porsche Club of...
$15,000
Private Seller
 
US
Omega De Ville Prestige 42453402102001 Very good Rose gold 39mm Automatic United States of America, Virginia, Vienna
Omega De Ville Prestige Automatic, Silver Dial, 18kt Rose...
$7,000
Free shipping
Professional dealer
53
US
Omega Seamaster 300 233.30.41.21.01.001 Unworn Steel 41mm Automatic United States of America, California, Torrance
TOP
Omega Seamaster 300 Master Co-Axial
$4,875
Private Seller
 
US
Omega Speedmaster Professional Moonwatch 31192445101003 Very good Ceramic 44.25mm Automatic United States of America, New York, New York
TOP
Omega Speedmaster Professional Moonwatch
$7,450
Private Seller
 
US
Omega Seamaster Diver 300 M 212.30.41.20.01.003 Good United States of America, Washington, Everett
TOP
Omega Seamaster Black Dial Automatic Steel Mens Watch
$2,400
Private Seller
 
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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