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Omega Seamaster Diver 300 M 210.30.42.20.01.001 New Steel 42mm Automatic
TOP
Omega Seamaster Diver 300 M Co-Axial Master Chronometer 42 mm...
C$ 5,796
Professional dealer
4492
US
Breitling Superocean 42 a17364y4/ba89 Very good Steel Automatic
TOP
Breitling Superocean Orange 42 mm limited edition Automatic...
C$ 3,198
Professional dealer
75
US
Omega De Ville Hour Vision 431.30.41.21.01.001 New Steel 41mm Automatic
TOP
Omega De Ville Hour Vision Co-Axial 41 mm Automatic Black Dial...
C$ 5,921
Professional dealer
4492
US
Ball Engineer II DG2018C-S10C-BK New Steel 42mm Automatic
TOP
Ball DG2018C-S10C-BK LIMITED EDITION Men's Engineer Aero GMT...
C$ 3,061
Professional dealer
558
US
Tudor Black Bay 79230B-0002 Very good Steel 41mm Automatic Canada, Montreal
Tudor Heritage Black Bay - Blue 41mm In-House Movement (extra...
C$ 4,243
Free shipping
Professional dealer
28
CA
Breitling Navitimer 8 A13314101B1X1 Unworn Steel 43mm Automatic
TOP
Breitling Navitimer 8 Stainless Steel Black Arabic Dial Watch...
C$ 4,996
Free shipping
Professional dealer
357
US
Rolex Submariner Date 126610LN New Steel 41mm Automatic Canada, North Vancouver
Rolex Submariner Date 41mm
C$ 19,870
Free shipping
Professional dealer
17
CA
Omega Constellation 168.005 Very good Gold/Steel 34mm Automatic
TOP
Omega Constellation Pie Pan Türler Chronometer Stahl Gold ...
C$ 6,036
Professional dealer
678
DE
Rolex Sea-Dweller 126600 Unworn Steel 43mm Automatic
TOP
Rolex Sea-Dweller Red 43mm Box/Papers/Card 126600 SD43 Mk2
C$ 19,363
Free shipping
Professional dealer
186
US
Rolex Submariner Date 126610LN Unworn Steel 41mm Automatic Canada, Toronto
TOP
Rolex Submariner Date
C$ 18,300
Private Seller
 
CA
Ball DG3030B-S3CJ-BK New Titanium 40mm Automatic
TOP
Ball Roadmaster Marine GMT Ceramic Brown
C$ 3,291
Free shipping
Professional dealer
142
JP
Omega Constellation Very good 35mm Automatic
TOP
Omega Constellation Vintage Pie Pan Dial 18Kts Solid Gold...
C$ 5,597
Professional dealer
142
BE
Breitling Bentley Motors A25362 Very good Steel 48.5mm Automatic
Breitling Bentley Motors Chronograph Automatik Edelstahl...
C$ 5,975

Sold by Chrono24

DE
Rolex Day-Date 36 18238 Very good Yellow gold 36mm Automatic Canada, Montreal
Rolex Day-Date President Diamond Bezel {2.85 ct / 7pts} 18k...
C$ 29,000
Free shipping
Professional dealer
28
CA
Breitling EB2040101L1X1 Unworn Titanium 46mm Automatic
TOP
Breitling Aviator Super 8 Titanium Green Arabic Dial Watch...
C$ 4,746
Free shipping
Professional dealer
357
US
Omega Speedmaster HB-SIA 321.92.44.52.01.001 Very good Titanium 44mm Automatic
TOP
Omega Speedmaster HB-SIA GMT 44mm Titanium Carbon
C$ 6,559
Professional dealer
15
US
Omega Constellation 2648 SC Very good Yellow gold 35mm Automatic
TOP
Omega Constellation Pie Pan 18K Gold Gelbgold Hammer Automatik...
C$ 6,792
Professional dealer
678
DE
Rolex Daytona 116505 Unworn Rose gold 40mm Automatic
TOP
Rolex Daytona Rose Gold Diamond Dial 116505
C$ 92,184
Free shipping
Professional dealer
781
UK
Rolex Submariner Date 126610LN Very good Steel 41mm Automatic Canada, Toronto
TOP
Rolex Submariner Date mint condition
C$ 18,200
Private Seller
 
CA
Ball Engineer Hydrocarbon Nedu DC3026A-S3CJ-BE New Titanium 42mm Automatic
TOP
Ball Engineer Hydrocarbon NEDU
C$ 5,107
Free shipping
Professional dealer
142
JP
Rolex Datejust 126334 Unworn Steel 41mm Automatic
Rolex 126334 Datejust 41 Wimbledon Dial 2020 Stainless Steel
C$ 18,734
Free shipping
Professional dealer
271
US
Breitling Chronomat 44 HB0110 Unworn Yellow gold 44mm Automatic
Breitling Chronomat 44 18K Gold Automatik Herrenuhr Ref....
C$ 21,737

Sold by Chrono24

DE
Tudor Black Bay Fifty-Eight M79030B Unworn Steel 39mm Automatic Canada, Montreal
Tudor Black Bay Fifty-eight Blue (Nato) Unworn - 5 Years Warranty
C$ 5,800
Free shipping
Professional dealer
28
CA
Breitling Galactic 36 W7433012A779 Unworn Steel 36mm Quartz
TOP
Breitling Galactic Stainless Steel MOP Index Dial Watch...
C$ 5,246
Free shipping
Professional dealer
357
US
Breitling Transocean Day & Date A45310 Good Steel 43mm Automatic
TOP
Breitling Transocean Day Date Steel Blue Dial Limited Edition...
C$ 3,873
Professional dealer
15
US
Rolex Datejust 68278 MINT Very good Yellow gold 31mm Automatic
TOP
Rolex Datejust 18K Gold Gelbgold Papiere Automatic Medium Mid...
C$ 27,213
Professional dealer
678
DE
Rolex Daytona 116509 Very good White gold 40mm Automatic
TOP
Rolex Daytona White Gold Racing Dial 116509
C$ 48,287
Free shipping
Professional dealer
781
UK
Omega Speedmaster Professional Moonwatch 311.92.44.51.01.006 New Ceramic Automatic
Omega Dark Side Of The Moon Speedmaster
C$ 14,367
Professional dealer
342
US
Ball Engineer Hydrocarbon DM2118B-S2CJ-BK New Steel 40mm Automatic
TOP
Ball Engineer Hydrocarbon Original (40mm)
C$ 3,348
Free shipping
Professional dealer
142
JP
Rolex Datejust 126334 Unworn White gold 41mm Automatic
Rolex 126334 Datejust 41 Dark Rhodium Dial 2020 Stainless Steel
C$ 16,610
Free shipping
Professional dealer
271
US
Vacheron Constantin Overseas 42050-72050/1 Very good Steel 35mm Automatic
Vacheron Constantin Overseas Chronometer Automatik Herrenuhr...
C$ 13,160

Sold by Chrono24

DE
Rolex Lady-Datejust 178240 Good Steel 31mm Automatic Canada, Montreal
Rolex Datejust 31 Lady - Full Set - Ivory White Dial
C$ 7,100
Free shipping
Professional dealer
28
CA
Breitling Navitimer 8 A13314101B1A1 Unworn Steel 43mm Automatic
TOP
Breitling Navitimer 8 Stainless Steel Black Arabic Dial Watch...
C$ 5,121
Free shipping
Professional dealer
357
US
Breitling Avenger Skyland M1338010/B864 Very good Steel 45mm Automatic
TOP
Breitling Avenger 45mm Skyland Blacksteel Limited Edition...
C$ 4,855
Professional dealer
15
US
Girard Perregaux Ferrari 9020 SPLIT SECOND FOUDROYANTE SERVICE 09.2018 Very good Platinum 40mm Automatic
TOP
Girard Perregaux FERRARI CHRONOGRAPH RATTRAPANTE AUTOMATIC...
C$ 30,239
Professional dealer
678
DE
Tudor Tiger Prince Date 79263 Very good Gold/Steel 40mm Automatic Canada, Pickering
TOP
Tudor Tiger Prince Date
C$ 7,800
Private Seller
 
CA
Omega Seamaster Diver 300 M 210.30.42.20.03.001 Very good Steel 42mm Automatic
TOP
Omega Seamaster Diver 300 M Reference #: 210.30.42.20.03.001
C$ 5,497
Professional dealer
77
US
Ball Engineer Hydrocarbon Deepquest DM3002A-SC-BK New Titanium 42mm Automatic
TOP
Ball Engineer Hydrocarbon DeepQUEST II
C$ 4,313
Free shipping
Professional dealer
142
JP
Rolex Submariner (No Date) 124060 Unworn Steel 41mm Automatic
Rolex Submariner 124060 41mm No Date Stainless Steel IN STOCK
C$ 17,360
Free shipping
Professional dealer
271
US
Omega Seamaster Diver 300 M 2537.80.00 Very good Steel 41.5mm Automatic
Omega Seamaster Diver 300M Chronometer Limitiert Herrenuhr...
C$ 7,548

Sold by Chrono24

DE
Rolex Datejust 126200 Very good Steel 36mm Automatic Canada, Montreal
Rolex Datejust 36mm Blue Dial - Full Set - Extremely Clean /...
C$ 10,750
Free shipping
Professional dealer
CA
Breitling Navitimer 8 AB0117131B1A1 Unworn Steel 43mm Automatic
TOP
Breitling Navitimer 8 Stainless Steel Black Arabic Dial Watch...
C$ 7,870
Free shipping
Professional dealer
357
US
Omega Seamaster Planet Ocean Chronograph 232.30.46.51.01.003 Very good Steel 45.5mm Automatic
TOP
Omega Seamaster Planet Ocean 45.5 Chronograph Black Dial Steel
C$ 6,875
Professional dealer
15
US
Omega Constellation 168.010/11 Very good Red gold 35mm Automatic
TOP
Omega Constellation Pie Pan Chronometer 18K Rotgold Pinkgold...
C$ 6,792
Professional dealer
678
DE
Rolex Datejust 1603 Very good Steel 36mm Automatic
TOP
Rolex Datejust 1603 Silver Pie Pan 1966
C$ 7,412
Free shipping
Professional dealer
166
DE
Rolex Datejust 126334 New Steel 41mm Automatic
Rolex Datejust41 126334 "Wimbledon" Slate Green Roman Jubilee
C$ 19,052
Free shipping
Professional dealer
167
US
Ball Engineer Hydrocarbon Deepquest DM3002A-SC-WH New Titanium 42mm Automatic
TOP
Ball Engineer Hydrocarbon DeepQUEST II
C$ 4,313
Free shipping
Professional dealer
142
JP
Rolex Submariner Date 126610LN Unworn Steel 41mm Automatic
Rolex Submariner Date 126610LN 41mm Stainless Steel Mens Watch...
C$ 19,733
Free shipping
Professional dealer
271
US
Rolex Datejust 126334 Unworn Gold/Steel 41mm Automatic
Rolex Datejust 41 Stahl / Weissgold Automatik Herrenuhr Ref....
C$ 17,063

Sold by Chrono24

DE
Tudor Black Bay GMT 79830RB-0002 New Steel 41mm Automatic Canada, Montreal
Tudor Black Bay GMT "Pepsi" UNWORN + 5 Years Warranty
C$ 5,860
Free shipping
Professional dealer
CA
Rolex Sea-Dweller 126600 Very good Steel 43mm Automatic
Rolex Sea-Dweller SD43 50th Anniversary
C$ 18,240
Professional dealer
351
US
Breitling Chronomat AB011610/BB08 Very good Steel 44mm Automatic
TOP
Breitling 44 Flying Fish Chronomat Steel Extra Strap and Warranty
C$ 6,539
Professional dealer
15
US
Rolex Datejust 6827 Very good Yellow gold 30mm Automatic
TOP
Rolex Oyster Perpetual Datejust Medium Midsize 18K Gold Yellow...
C$ 15,112
Professional dealer
678
DE
Rolex Submariner Date 16618 Unworn Yellow gold 40mm Automatic
Rolex Submariner Date - Unpolished Mint Full Set
C$ 44,418
Professional dealer
9
US
Rolex Submariner (No Date) 124060 New Steel 41mm Automatic
Rolex Submariner No Date 41mm with stickers NEW Unworn
C$ 18,364
Free shipping
Professional dealer
167
US
Ball Engineer Hydrocarbon Nedu DC3026A-SCJ-BK New Titanium 42mm Automatic
TOP
Ball Engineer Hydrocarbon NEDU
C$ 5,107
Free shipping
Professional dealer
142
JP
Omega Seamaster Aqua Terra 231.10.42.21.03.003 Very good Steel 41.5mm Automatic
TOP
Omega 41.5 Seamaster Aqua Terra Automatic
C$ 5,185
Professional dealer
64
US
Omega Globemaster 130.30.39.21.02.001 Very good Steel 39mm Automatic
Omega Constellation Globemaster Co-Axial Ref. 130.30.39.21.02....
C$ 8,335

Sold by Chrono24

DE
Omega Speedmaster Racing 326.30.40.50.01.001 Very good Steel 40mm Automatic
Omega Speedmaster Racing
C$ 4,560
Professional dealer
121
US
Rolex Sea-Dweller 126600 Unworn Steel 43mm Automatic
Rolex 126600 UNWORN 2020 Sea-Dweller RED Stainless Steel Men’s
C$ 21,108
Free shipping
Professional dealer
271
US
Ulysse Nardin El Toro / Black Toro 329-00 Unworn Platinum 43mm Automatic
Ulysse Nardin El Toro El Toro GMT Perpetual Calendar Platinum...
C$ 45,007
Professional dealer
17
US
Omega Speedmaster Professional Moonwatch 310.32.42.50.01.002 Unworn Steel 42mm Manual winding
Omega Speedmaster Professional Sapphire
C$ 9,183
Professional dealer
351
US
Rolex Datejust 126334 New Steel 41mm Automatic
Rolex Datejust 41mm 2020 Rhodium Dial 126334 Full Stickers
C$ 14,928
Professional dealer
457
US
Jaeger-LeCoultre Geophysic 1958 Jaeger-Lecoultre E168 Geophysic 1958 Very good Steel Manual winding
Jaeger-LeCoultre Geophysic E168 Amagnetic
C$ 57,469
Professional dealer
8
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.