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Omega Seamaster Aqua Terra 231.10.42.21.01.006 New Steel 41.5mm Automatic
TOP
Omega Seamaster Aqua Terra 150M Master Co-Axial 41.5 mm...
C$ 5,702
Free shipping
Verified Dealer
2580
US
Omega Speedmaster Professional Moonwatch Moonphase 304.23.44.52.06.001 New 44.25mm Automatic
TOP
Omega Speedmaster Moonwatch Co-Axial Master Chronometer...
C$ 13,905
Free shipping
Verified Dealer
2580
US
Omega Seamaster Aqua Terra 220.13.41.21.01.001 New Steel 41mm Automatic
TOP
Omega Seamaster Aqua Terra 150M Co-Axial Master Chronometer...
C$ 5,205
Free shipping
Verified Dealer
2580
US
Omega Seamaster Planet Ocean 232.63.46.21.01.001 New Red gold 45.5mm Automatic
TOP
Omega Seamaster Planet Ocean 600M Co‑Axial 45.5mm
C$ 24,140
Free shipping
Verified Dealer
623
US
Rolex Sea-Dweller 126600 New Steel 43mm Automatic
TOP
Rolex Sea-Dweller Black Dial 126600 NEW 2020
C$ 20,023
Free shipping
Verified Dealer
46
US
Rolex Explorer II 16570T Very good Steel 40mm Automatic Canada, Victoria British Columbia
TOP
Rolex Explorer II POLAR T case SEL bracelet Y serial 2002
C$ 10,150
Verified Dealer
54
CA
Chopard Grand Prix de Monaco Historique 168569-3001 New Titanium 44.5mm Automatic
TOP
Chopard Grand Prix de Monaco Historique
C$ 5,931
Verified Dealer
72
US
Rolex Datejust 126334 New Steel 41mm Automatic
TOP
Rolex Datejust 41 Blue Roman White Gold Fluted Jubilee Box/Papers
C$ 15,189
Free shipping
Verified Dealer
51
US
Omega Seamaster Diver 300 M 210.30.42.20.01.001 New Steel 42mm Automatic Canada, Victoria
Omega Seamaster Diver 300 M
C$ 5,950
Verified Dealer
8
CA
Omega Seamaster Planet Ocean Chronograph 215.90.46.51.99.001 Unworn Titanium 45.5mm Automatic
Omega Seamaster Planet Ocean Chronograph Titanium New 04/2019
C$ 9,697
Verified Dealer
197
IT
Omega Constellation 168005/6 Automatic Chronometer Very good Yellow gold 35mm Automatic
TOP
Omega Constellation Pie Pan 18K Gold Gelbgold Automatik
C$ 6,240
Verified Dealer
560
DE
Omega Seamaster Planet Ocean 215.30.44.21.03.001 New Steel 43.5mm Automatic
Omega Seamaster Planet Ocean 8900 43.5mm Blue Master Chronometer
C$ 6,870
Free shipping
Verified Dealer
402
US
Rolex Datejust 16233 Very good Steel 36mm Automatic
Rolex Datejust Steel Yellow Gold Black Dial Mens Watch 16233 Box
C$ 7,720
Free shipping
Verified Dealer
614
US
Chopard Mille Miglia 168571-3001 New Steel 44mm Automatic
TOP
Chopard Mille Miglia
C$ 5,937
Verified Dealer
 
US
Omega Speedmaster Racing 329.30.44.51.01.002 Very good Steel 44.25mm Automatic
TOP
Omega Speedmaster Racing | Master Chronometer Chronograph 9900...
C$ 8,279
Verified Dealer
11
US
Rolex Submariner Date 16610 T Very good Steel 40mm Automatic
TOP
Rolex Submariner Date Steel Watch 40MM 16610 F Serial w/Papers
C$ 11,807
Verified Dealer
129
US
Breitling Bentley GT A1336313 Very good Steel 45mm Automatic
TOP
Breitling Bentley GT Racing - White Dial - Box/Papers
C$ 6,904
Free shipping
Verified Dealer
51
US
Omega Seamaster Diver 300 M 210.30.42.20.03.001 New Steel 42mm Automatic Canada, Victoria
Omega Seamaster Diver 300 M
C$ 5,950
Verified Dealer
8
CA
Chopard Mille Miglia 168571-3004 Very good Steel 44mm Manual winding Canada, Burlington
TOP
Chopard 4105091 Chopard Mille Miglia Race Edition no 826/1000
C$ 6,000
Private Seller
 
CA
Omega Constellation 168005/6 Automatic Chronometer Very good Yellow gold 35mm Automatic
TOP
Omega Constellation Pie Pan 18K Gold Gelbgold Automatik
C$ 7,804
Verified Dealer
560
DE
Rolex Sea-Dweller 4000 16600 Very good Steel 40mm Automatic
TOP
Rolex Sea-Dweller 16600
C$ 13,738
Free shipping
Verified Dealer
583
UK
TAG Heuer Carrera Heuer-02T CAR5A8K.FT6172 New Titanium 45mm Automatic
TOP
TAG Heuer Calibre HEUER 02T Nanograph
C$ 29,001
Verified Dealer
372
US
Breitling Montbrillant K35330 Very good Yellow gold 42mm Automatic
TOP
Breitling Montbrilliant Navitimer Limited Edition 100 Pieces
C$ 13,803
Verified Dealer
57
US
Omega Seamaster Planet Ocean 232.32.44.22.03.001 Very good Steel 43.5mm Automatic
Omega Seamaster Planet Ocean Good Planet 44 GMT Blue Dial Ceramic
C$ 6,145
Verified Dealer
11
US
Breitling Avenger II A1338111/BC32-170A Good Steel 43mm Automatic
TOP
Breitling Avenger II Chronograph Black 43mm Steel A13381
C$ 3,727
Verified Dealer
995
US
Omega Speedmaster 3507.51.00 Very good Steel 42mm Automatic
TOP
Omega Speedmaster Schumacher 42 Legend Chronograph Panda 42mm...
C$ 5,239
Free shipping
Verified Dealer
315
US
Breitling Avenger II Seawolf M17331E2/I530 Very good Steel Automatic Canada, Langley
TOP
Breitling Avenger II Seawolf
C$ 4,600
Private Seller
 
CA
Omega Seamaster Diver 300 M 210.22.44.51.01.001 New Gold/Steel 44mm Automatic Canada, Victoria
Omega Seamaster Diver 300 M Master Chronometer Chronograph
C$ 12,000
Verified Dealer
8
CA
Girard Perregaux Ferrari 9020 SPLIT SECOND FOUDROYANTE SERVICE 09.2018 Very good Platinum 40mm Automatic
TOP
Girard Perregaux FERRARI CHRONOGRAPH RATTRAPANTE AUTOMATIC...
C$ 31,264
Verified Dealer
560
DE
Omega Constellation Ladies 123.50.35.20.52.001 Good Red gold 35mm Automatic
Omega コンステレーション コーアクシャル 123.50.35.20.52.001
C$ 12,843
Free shipping
Verified Dealer
1126
JP
Ulysse Nardin Marine Chronometer Manufacture 1183-126-3/43 New Steel 43mm Automatic
TOP
Ulysse Nardin Marine Chronometer 43mm Automatic Watch Blue...
C$ 11,342
Free shipping
Verified Dealer
61
US
Rolex Datejust 126334 New Steel 41mm Automatic
Rolex Datejust 41mm 126334 NEW 2020
C$ 14,775
Verified Dealer
314
US
Omega Constellation Day-Date 168.045 Very good Yellow gold 40mm Automatic
Omega Constellation 168.045 Day-Date 18ct Gold Vintage Gents...
C$ 9,850
Verified Dealer
85
UK
Ulysse Nardin Marine Chronometer Manufacture 1185-126/45 Unworn Gold/Steel 43mm Automatic
TOP
Ulysse Nardin Marine Manufacture 18k Rose Gold Steel 1185-126/...
C$ 7,318
Verified Dealer
995
US
Girard Perregaux Very good Steel 34mm Automatic
TOP
Girard Perregaux Men's Girard Perregaux Gyromatic 34mm...
C$ 4,005
Free shipping
Verified Dealer
702
US
Breitling Chronomat 44 AB011012/B967/375A Very good Steel 44mm Automatic Canada, Montreal
Breitling Chronomat 44 (In-house) "Panda" Black/Blue Dial -...
C$ 6,300
Verified Dealer
17
CA
Rolex Sea-Dweller 126600 New Steel 43mm Automatic
TOP
Rolex Sea-Dweller
C$ 19,748
Free shipping
Verified Dealer
136
US
Rolex GMT-Master II 16710T Very good Steel 40mm Automatic
TOP
Rolex GMT-Master II Stainless Steel Pepsi Bezel Oyster Ref....
C$ 16,503
Verified Dealer
8
US
Omega Seamaster Planet Ocean 232.30.42.21.01.001 Good Steel 42mm Automatic
Omega シーマスター 600 プラネットオーシャン コーアクシャル 232.30.42.21.01.001
C$ 4,495
Free shipping
Verified Dealer
1126
JP
Breitling Superocean 44 M1739313/BE92 Very good 44mm Automatic
TOP
Breitling Superocean 44 Special Black PVD Steel Automatic Dive...
C$ 5,201
Free shipping
Verified Dealer
61
US
Rolex Datejust 126334 New Steel 41mm Automatic
Rolex Datejust 41mm 126334 Rhodium Dial NEW 2020
C$ 14,775
Verified Dealer
314
US
Omega Seamaster 368.1041 Very good Steel 39mm Automatic
TOP
Omega Seamaster Pre Bond Cal. 1110 Bicolor 1984
C$ 3,910
Free shipping
Verified Dealer
100
DE
Breitling Avenger Blackbird V173104A/CA23 Unworn Titanium 48mm Automatic
TOP
Breitling Avenger Blackbird Blue LIMITED 48mm V173104A/CA23 (NEW)
C$ 4,142
Verified Dealer
995
US
Bremont ALT1-C Classic ALT1-C/CR Very good Steel 43mm Automatic
Bremont Classic ALT1-C/CR Classic Cream Dial BOX & PAPERS 2016
C$ 6,117
Verified Dealer
325
UK
Omega Seamaster Diver 300 M 212.30.42.50.01.001 Good Steel 41.5mm Automatic
Omega Seamaster Diver Chronograph Diver Co-Axial 41.5mm
C$ 4,902
Verified Dealer
8
US
Rolex Datejust 16013 Good Steel 36mm Automatic
Rolex Datejust 36 Steel Yellow Gold Vintage Mens Watch 16013
C$ 6,339
Free shipping
Verified Dealer
614
US
Rolex Sea-Dweller Deepsea 126660 Very good Steel 44mm Automatic
Rolex Sea-Dweller Deepsea
C$ 16,917
Verified Dealer
5
US
TAG Heuer Grand Carrera WAV5113.BA0901 Good Steel 42.5mm Automatic
TAG Heuer グランド カレラ キャリバー8 GMT WAV5113.BA0901
C$ 2,543
Free shipping
Verified Dealer
1126
JP
Omega Speedmaster Professional Moonwatch 310.20.42.50.01.001 New Steel 42mm Manual winding
Omega Speedmaster Professional Moonwatch Apollo 11
C$ 16,254
Verified Dealer
7
US
Rolex Datejust 126334 New Steel 41mm Automatic
Rolex Datejust 41mm 2019 NEW Blue Roman 126334
C$ 14,154
Verified Dealer
314
US
Breitling 634360 Very good Steel 44mm Automatic
TOP
Breitling Edition Special Limited A25 Exemplaires - G34360
C$ 156,397
Free shipping
Verified Dealer
700
NL
Breitling Chronomat 44 AB0115101C1P1 Unworn Steel 44mm Automatic
TOP
Breitling Chronomat 01 AB0115 Blue 44mm Chronograph AB0115101C...
C$ 5,799
Verified Dealer
995
US
Omega Seamaster Aqua Terra 220.10.43.22.03.001 Unworn Steel 43mm Automatic
Omega Seamaster Aqua Terra 150M GMT Worldtime UNWORN 2020
C$ 12,597
Verified Dealer
325
UK
Omega Seamaster Planet Ocean Chronograph 232.30.46.51.01.001 Good Steel Automatic
Omega Seamaster Planet Ocean Chronograph Watch
C$ 5,662
Verified Dealer
8
US
Rolex Lady-Datejust Pearlmaster 80299 Very good White gold 29mm Automatic
Rolex Pearlmaster White Gold MOP Diamond Ladies Watch 80299...
C$ 26,225
Free shipping
Verified Dealer
614
US
Omega Speedmaster '57 331.20.42.51.01.002 Unworn Gold/Steel 41.5mm Automatic
TOP
Omega SPEEDMASTER '57 OMEGA CO‑AXIAL CHRONOGRAPH Red GoldGold
C$ 13,164
Verified Dealer
108
JP
Omega Seamaster Planet Ocean 222.18.46.20.01.001 Very good Steel 46mm Automatic
Omega シーマスター 600 プラネットオーシャン コーアクシャル 222.18.46.20.01.001
C$ 10,274
Free shipping
Verified Dealer
1126
JP
Omega Seamaster Planet Ocean 215.30.44.21.01.001 New Steel 43.5mm Automatic
Omega Seamaster Planet Ocean
C$ 7,084
Verified Dealer
7
US
Rolex Sea-Dweller 126600 New Steel 43mm Automatic
Rolex Sea-Dweller 126600 NEW 2020
C$ 19,954
Verified Dealer
314
US
Omega Seamaster Aqua Terra 231.10.42.22.01.001 Very good Steel 41.5mm Automatic
Omega Seamaster Aqua Terra Day Date NEW CONDITIONS
C$ 8,010
Verified Dealer
5
US
Omega Speedmaster '57 331.10.42.51.03.001 Very good Steel 41.5mm Automatic
TOP
Omega Speedmaster '57 Blue 41.5mm 9300 Auto 331.10.42.51.03.001
C$ 6,006
Verified Dealer
995
US
Rolex Datejust 126334 Very good Steel 41mm Automatic
Rolex Datejust - Jubilee - 126334
C$ 14,500
Free shipping
Verified Dealer
9
US
Ulysse Nardin Marine Chronometer 41mm 263-66 Fair Steel 41mm Automatic
Ulysse Nardin Marine Chronometer 41mm White Dial Automatic
C$ 4,557
Verified Dealer
8
US
Rolex Lady-Datejust 79174 Very good Steel 26mm Automatic
Rolex Datejust Steel White Gold Diamond Ladies Watch 79174 Box...
C$ 6,201
Free shipping
Verified Dealer
614
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.