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Omega Seamaster Aqua Terra 231.10.43.22.03.001 New Steel 43mm Automatic United States of America, California, San Mateo
TOP
Omega Seamaster Aqua Terra 150M Co-Axial GMT 43 mm Automatic...
$6,879
Free shipping
Professional dealer
4495
US
Rolex Submariner Date 126610LN Unworn Steel 41mm Automatic United States of America, New York, New York
TOP
Rolex Submariner Date 41mm 126610LN Unworn 2021
$15,295
Free shipping
Professional dealer
646
US
Bremont PROJECT-POSSIBLE-S New Titanium 43mm Automatic United States of America, New Jersey, River Edge
TOP
Bremont PROJECT POSSIBLE LIMITED EDITION Automatic Leather...
$6,295
Free shipping
Professional dealer
559
US
Ball Engineer Hydrocarbon CM2198C-S1CJ-SL New Steel 42mm Automatic United States of America, New Jersey, River Edge
TOP
Ball CM2198C-S1CJ-SL Engineer Hydrocarbon Racer Chronograph...
$3,059
Free shipping
Professional dealer
559
US
Breitling Navitimer 8 A13314101B1X1 Unworn Steel 43mm Automatic United States of America, New York, New York
TOP
Breitling Navitimer 8 Stainless Steel Black Arabic Dial Watch...
$3,999
Free shipping
Professional dealer
357
US
Rolex Sea-Dweller 126600 Unworn Steel 43mm Automatic United States of America, California, Los Angeles
TOP
Rolex Sea-Dweller Red 43mm Box/Papers/Card 126600 SD43 Mk2
$15,499
Free shipping
Professional dealer
186
US
Rolex Datejust 126334 Unworn Steel 41mm Automatic United States of America, Florida, Miami
Rolex 126334 Datejust 41 Wimbledon Dial 2020 Stainless Steel
$14,995
Professional dealer
271
US
Omega Speedmaster Professional Moonwatch 311.92.44.51.01.006 New Ceramic Automatic United States of America, Georgia, Alpharetta
Omega Dark Side Of The Moon Speedmaster
$11,500
Free shipping
Professional dealer
342
US
Breitling Transocean Day & Date A45310 Good Steel 43mm Automatic United States of America, Illinois
TOP
Breitling Transocean Day Date Steel Blue Dial Limited Edition...
$3,100
Professional dealer
15
US
Omega Speedmaster Professional Moonwatch 310.60.42.50.01.001 Very good Rose gold 42mm Manual winding United States of America, California, Los Angeles
TOP
Omega Speedmaster Moonwatch Sedna Gold
$35,000
Professional dealer
257
US
Rolex Submariner Date 16618 Unworn Yellow gold 40mm Automatic United States of America, California, Los Angeles
Rolex Submariner Date - Unpolished Mint Full Set
$35,553
Professional dealer
9
US
Jaeger-LeCoultre Geophysic 1958 E168 Very good Rose gold 35.3mm Manual winding United States of America, New York, Westchester
Jaeger-LeCoultre Geophysic E168
$42,000
Professional dealer
8
US
Rolex Datejust 126334 New Steel 41mm Automatic United States of America, Florida, West Palm Beach
Rolex Datejust41 126334 "Wimbledon" Slate Green Roman Jubilee
$15,250
Free shipping
Professional dealer
167
US
Breitling Navitimer 8 AB0117131B1A1 Unworn Steel 43mm Automatic United States of America, New York, New York
TOP
Breitling Navitimer 8 Stainless Steel Black Arabic Dial Watch...
$6,299
Free shipping
Professional dealer
357
US
Omega Speedmaster Racing 326.30.40.50.01.001 Very good Steel 40mm Automatic United States of America, Arizona, SCOTTSDALE
Omega Speedmaster Racing
$3,650
Professional dealer
121
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
$13,295
Professional dealer
271
US
Omega Seamaster Diver 300 M 210.30.42.20.03.001 Very good Steel 42mm Automatic United States of America, California, Fullerton
TOP
Omega Seamaster Diver 300 M Reference #: 210.30.42.20.03.001
$4,400
Professional dealer
79
US
Omega Seamaster Planet Ocean Chronograph 232.30.46.51.01.003 Very good Steel 45.5mm Automatic United States of America, Illinois
TOP
Omega Seamaster Planet Ocean 45.5 Chronograph Black Dial Steel
$5,503
Professional dealer
15
US
Omega Seamaster Aqua Terra 231.10.42.21.03.003 Very good Steel 41.5mm Automatic United States of America, California, Pasadena
TOP
Omega 41.5 Seamaster Aqua Terra Automatic
$4,150
Professional dealer
67
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
40
US
Jaeger-LeCoultre Geophysic 1958 Jaeger-Lecoultre E168 Geophysic 1958 Very good Steel Manual winding United States of America, New York, Westchester
Jaeger-LeCoultre Geophysic E168 Amagnetic
$46,000
Professional dealer
8
US
Rolex Submariner (No Date) 124060 New Steel 41mm Automatic United States of America, Florida, West Palm Beach
Rolex Submariner No Date 41mm with stickers NEW Unworn
$14,699
Free shipping
Professional dealer
167
US
Breitling EB2040101L1X1 Unworn Titanium 46mm Automatic United States of America, New York, New York
TOP
Breitling Aviator Super 8 Titanium Green Arabic Dial Watch...
$3,799
Free shipping
Professional dealer
357
US
Rolex Datejust 178278 Very good Yellow gold 31mm Automatic United States of America, Arizona, SCOTTSDALE
Rolex Mid Size Datejust 18k
$22,850
Professional dealer
121
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
$13,895
Professional dealer
271
US
Ulysse Nardin El Toro / Black Toro 329-00 Unworn Platinum 43mm Automatic United States of America, New York, New York
Ulysse Nardin El Toro El Toro GMT Perpetual Calendar Platinum...
$36,025
Professional dealer
17
US
Breitling Avenger Skyland M1338010/B864 Very good Steel 45mm Automatic United States of America, Illinois
TOP
Breitling Avenger 45mm Skyland Blacksteel Limited Edition...
$3,886
Professional dealer
15
US
Rolex Datejust 126334 Unworn Steel 41mm Automatic United States of America, New York, New York
Rolex Datejust 41mm Fluted Blue Stick Dial Jubilee 126334...
$13,645
Free shipping
Professional dealer
646
US
Rolex Submariner Date 16610 T Very good Steel 40mm Automatic United States of America, New York, New York
Rolex Submariner Date Steel Black 40mm 16610T Transitional
$10,199
Professional dealer
126
US
Rolex Sea-Dweller 126600 Very good Steel 43mm Automatic United States of America, Tennesse, Nashville
Rolex Sea-Dweller SD43 50th Anniversary
$14,600
Free shipping
Professional dealer
353
US
Omega Speedmaster Professional Moonwatch 310.60.42.50.01.001 New Red gold 42mm Manual winding United States of America, California, Newport Beach
Omega Speedmaster 2021 Moonwatch Professional Co-Axial Master...
$39,904
Free shipping
Professional dealer
40
US
Breitling Navitimer 8 A13314101B1A1 Unworn Steel 43mm Automatic United States of America, New York, New York
TOP
Breitling Navitimer 8 Stainless Steel Black Arabic Dial Watch...
$4,099
Free shipping
Professional dealer
357
US
Rolex Sea-Dweller 126600 Very good Steel 43mm Automatic United States of America, Arizona, SCOTTSDALE
Rolex Sea-Dweller
$15,900
Professional dealer
121
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
$16,895
Professional dealer
271
US
Rolex Sea-Dweller 4000 126600 Unworn Steel 43mm Automatic United States of America, New York, New York
Rolex Sea-Dweller 4000 Red Letter Dial Ceramic 50th Anniversar...
$18,300
Professional dealer
17
US
Breitling Chronomat AB011610/BB08 Very good Steel 44mm Automatic United States of America, Illinois
TOP
Breitling 44 Flying Fish Chronomat Steel Extra Strap and Warranty
$5,234
Professional dealer
15
US
Rolex Submariner (No Date) 124060 Unworn Steel 41mm Automatic United States of America, New York, New York
Rolex Submariner No Date 41mm 124060 2021 Unworn
$13,675
Free shipping
Professional dealer
646
US
Rolex Datejust 126334 New Steel 41mm Automatic United States of America, New Jersey, Totowa
Rolex Datejust 41mm 2020 Rhodium Dial 126334 Full Stickers
$11,949
Professional dealer
457
US
Rolex Submariner (No Date) 124060 New Steel 41mm Automatic United States of America, New York, New York City
TOP
Rolex Submariner No Date, 41mm, 2021, 124060, Unworn, Complete
$13,375
Free shipping
Professional dealer
48
US
Omega Seamaster 300 233.30.41.21.01.001 Very good Steel 41mm Automatic United States of America, California, Los Angeles
Omega Seamaster 300 Steel Master Co-Axil Chronometer Black...
$4,865
Professional dealer
243
US
Rolex Datejust 126334 Very good Steel 41mm Automatic United States of America, New York, New York
Rolex Datejust 41 Stainless Steel and White Gold White Roman...
$12,199
Free shipping
Professional dealer
357
US
Ulysse Nardin Marine 1183-170-3/93 Very good Titanium 44mm Automatic United States of America, Arizona, SCOTTSDALE
Ulysse Nardin Diver Chronometer
$5,550
Professional dealer
121
US
Rolex Submariner Date 126610LN Unworn Steel 41mm Automatic United States of America, Florida, Miami
Rolex Submariner Date 126610LN 41mm Stainless Steel Mens Watch...
$15,795
Professional dealer
271
US
Rolex Datejust Oysterquartz 17013 Very good Steel 36mm Quartz United States of America, Michigan, Warren
TOP
Rolex Oysterquartz Datejust 17013 18k Solid Yellow Gold & SS...
$5,595
Free shipping
Professional dealer
64
US
Rolex Day-Date 18248 Good Yellow gold 36mm Automatic United States of America, New York, New York
Rolex Day-Date President Factory Diamond Bezel and Dial 18k 18248
$20,999
Professional dealer
126
US
Rolex Datejust 126334 New Steel 41mm Automatic United States of America, New Jersey, Totowa
Rolex Datejust 41mm 126334 2021 Rhodium Stick Dial
$13,799
Professional dealer
457
US
Omega Seamaster Diver 300 M 210.30.42.20.03.001 New Steel 42mm Automatic United States of America, New York, New York City
TOP
Omega Seamaster Diver 300 M, Blue, 42mm, Steel, UNWORN, 2021,...
$4,750
Free shipping
Professional dealer
48
US
Omega Speedmaster Professional Moonwatch 310.32.42.50.01.002 Unworn Steel 42mm Manual winding United States of America, Tennesse, Nashville
Omega Speedmaster Professional Sapphire
$7,350
Free shipping
Professional dealer
353
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
$12,799
Free shipping
Professional dealer
357
US
Ulysse Nardin El Toro / Black Toro 326-03 Very good Rose gold 43mm Automatic United States of America, Arizona, SCOTTSDALE
Ulysse Nardin El Toro
$27,800
Professional dealer
121
US
H.Moser & Cie. 3200-1204 Very good Steel 42.8mm Automatic United States of America, New York, Smithtown
H.Moser & Cie. RARE 50 MADE H. Moser & Cie. Pioneer Blue...
$24,993
Free shipping
Professional dealer
445
US
Rolex Datejust 126334 New Steel 41mm Automatic United States of America, Illinois, Chicago
Rolex Datejust 41mm Fluted Black Stick Dial Jubilee 126334 2021
$12,095
Free shipping
Professional dealer
 
US
Omega Seamaster Aqua Terra 220.10.43.22.03.001 New Steel 43mm Automatic United States of America, New York, Massapequa
Omega Seamaster Aqua Terra 150m GMT Worldtimer 220.10.43.22.03...
$10,000
Professional dealer
36
US
Rolex Sea-Dweller 126600 Unworn Steel 43mm Automatic United States of America, New York, New York
Rolex Sea-Dweller SD43 126600 2021 Unworn
$15,495
Free shipping
Professional dealer
646
US
Ball Engineer M NM2128C-S1C-BK Very good 43mm Automatic United States of America, Florida, Coral Springs
TOP
Ball Engineer M Marvelight
$1,795
Private Seller
 
US
Rolex Submariner Date 126610LN New Steel 41mm Automatic United States of America, New York, New York City
TOP
Rolex Submariner Date, 41mm, NEW 2021, 126610LN, Unworn, Complete
$15,850
Free shipping
Professional dealer
48
US
Rolex Datejust 126334 Very good Steel 41mm Automatic United States of America, Tennesse, Nashville
Rolex DateJust 41
$10,150
Free shipping
Professional dealer
353
US
Rolex Datejust 126334 Unworn Steel 41mm Automatic United States of America, New York, New York
Rolex Datejust 41 Stainless Steel white Gold White Index Dial...
$13,299
Free shipping
Professional dealer
357
US
Omega Speedmaster Mark II 327.20.43.50.01.001 Very good Gold/Steel 42.4mm Automatic United States of America, Arizona, SCOTTSDALE
Omega Speedmaster Mark Ii
$8,750
Professional dealer
121
US
Rolex Datejust 126334 New Steel 41mm Automatic United States of America, New Jersey, Totowa
Rolex Datejust 41mm 126334 Black Diamond Dial 2021
$14,449
Professional dealer
457
US
Montblanc Timewalker 104282 Unworn Rose gold 43mm Automatic United States of America, California, Los Angeles
Montblanc TimeWalker Chronograph Rose Gold Diamonds
$15,551
Professional dealer
9
US
Omega Seamaster Planet Ocean Chronograph 232.30.46.51.01.003 Very good Steel 45.5mm Automatic United States of America, California, Pasadena
TOP
Omega 45.5mm Seamaster Planet Ocean, never polished.
$5,345
Professional dealer
67
US
Rolex Datejust 126334 Unworn Steel 41mm Automatic United States of America, New York, New York
Rolex Datejust 41mm Fluted Black Stick Dial Jubilee 126334 Unworn
$12,845
Free shipping
Professional dealer
646
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.