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Omega Seamaster 300 233.32.41.21.01.001 Unworn Steel 41mm Automatic
TOP
Omega Seamaster James Bond 007 SPECTRE unworn Fullset
AU$ 15,689
Verified Dealer
23
AT
Urwerk UR-210 UR-210BPT Royal Hawk Very good Platinum 53.6mm Automatic
TOP
Urwerk UR-210 BPT Royal Hawk.
AU$ 193,156
Verified Dealer
11
US
Omega Speedmaster Professional Moonwatch 311.33.42.50.01.001 Very good Steel 42mm Manual winding
Omega Speedmaster Professional Moonwatch 50th
AU$ 13,269
Verified Dealer
 
FR
Rolex Datejust 126334 Unworn Steel 41mm Automatic Australia, Naremburn
Rolex Datejust Blue 2020 NEW
AU$ 14,800
Verified Dealer
 
AU
Omega De Ville Co-Axial 422.13.41.52.04.001 Good Steel 41mm Automatic
Omega OLYMPIC GAMES COLLECTION
AU$ 4,112
Verified Dealer
9
JP
Breguet Reine de Naples 8908BB/52/864.D00D New White gold Automatic
TOP
Breguet Reine de Naples, new, closing down sale - o.p.: 35.200...
AU$ 35,992
Verified Dealer
40
CH
Omega Seamaster Aqua Terra 231.28.30.20.55.001 New Gold/Steel 30mm Automatic
Omega Seamaster Aqua Terra 150M Co-Axial 30 MM
AU$ 14,469
Verified Dealer
344
IT
Chopard Mille Miglia 8316 Very good Steel 39mm Automatic
Chopard Mille Miglia Chrono
AU$ 3,588
Verified Dealer
1351
NL
Breitling Chronomat Evolution C13356 Very good Steel 44mm Automatic
Breitling Chronomat Evolution C13356 Diamond Bezel Watch
AU$ 8,806
Free shipping
Verified Dealer
315
US
Omega Seamaster Aqua Terra 220.10.41.21.06.001 Very good Steel 41mm Automatic
Omega Seamaster Aqua Terra
AU$ 4,840
Verified Dealer
26
DE
Omega Seamaster Planet Ocean 215.23.40.20.04.001 New Rose gold 39.5mm Automatic
Omega Seamaster Planet Ocean 600M Co‑Axial Master Chronometer...
AU$ 8,714
Free shipping
Verified Dealer
1864
US
Ulysse Nardin Marine Chronometer Manufacture 1183-126 Very good Steel 43mm Automatic
TOP
Ulysse Nardin Marine Chronometer 1183-126 Watch with Leather...
AU$ 8,499
Free shipping
Verified Dealer
558
US
Omega Seamaster Planet Ocean 215.33.44.21.01.001 Very good Steel 43.5mm Automatic
Omega Seamaster Planet Ocean 600m 215.33.44.21.01.001
AU$ 7,494
Free shipping
Verified Dealer
761
US
Omega Seamaster 300 233.30.41.21.01.001 Unworn Steel 41mm Automatic
Omega Seamaster 233.30.41.21.01.001
AU$ 6,843
Verified Dealer
2201
MC
Rolex Lady-Datejust 179384 New Steel 26mm Automatic
TOP
Rolex Lady-Datejust 26, new, closing down sale - o.p.: 17.500 CHF
AU$ 16,509
Verified Dealer
40
CH
Omega Speedmaster Racing 329.32.44.51.06.001 New Steel 44.2mm Automatic
Omega Speedmaster Racing
AU$ 9,839
Verified Dealer
344
IT
Rolex Datejust 16013 Very good Gold/Steel 36mm Automatic
Rolex Datejust 36 Gold/Steel Diamonds
AU$ 8,095
Verified Dealer
1351
NL
Omega Constellation Ladies 123.20.35.20.01.001 Very good 35mm Automatic
Omega コンステレーション コーアクシャル 123.20.35.20.01.001
AU$ 5,906
Free shipping
Verified Dealer
552
JP
Rolex Datejust 16233 Very good Steel 36mm Automatic
Rolex Datejust 16233 Rare Stella Diamond 36mm Steel Gold 750
AU$ 7,995
Verified Dealer
242
DE
Omega De Ville Prestige 424.13.40.20.02.001 Very good 40mm Automatic
Omega デ・ヴィル プレステージ
AU$ 3,353
Free shipping
Verified Dealer
23
JP
Chopard Mille Miglia 168566-3002 Very good Steel 43mm Automatic
TOP
Chopard Mille Miglia GTS Power Control 168566-3002 Watch with...
AU$ 6,799
Free shipping
Verified Dealer
558
US
Omega De Ville Hour Vision 431.63.41.21.13.001 Very good Rose gold 41mm Automatic
Omega De Ville Hour Vision 18K Rosegold 41mm - Full Set
AU$ 14,185
Verified Dealer
444
AT
Rolex Day-Date 36 118235 Unworn Rose gold 36mm Automatic
Rolex Oyster Perpetual Day-date President Gold New 118235
AU$ 34,873
Verified Dealer
896
PL
Breitling 634360 Very good Steel 44mm Automatic
TOP
Breitling Edition Special Limited A25 Exemplaires - G34360
AU$ 166,903
Free shipping
Verified Dealer
584
NL
Zenith El Primero 95.3001.3600/69.C817 New Titanium 42mm Automatic
Zenith Chronomaster El Primero 42 Chronograph
AU$ 14,085
Verified Dealer
344
IT
94888 S-296 New Steel 39.2mm Automatic Australia, Sydney
Titoni Master Series COSC Automatic 94888 S-296
AU$ 2,400
Verified Dealer
23
AU
Rolex Milgauss 116400GV Very good Steel 40mm Automatic
Rolex Milgauss black 116400
AU$ 9,672
Verified Dealer
433
ES
Rolex Datejust 16030 Very good Steel 36mm Automatic
Rolex Datejust 16030 Stainless Steel Rare Buckley Dial Automatic
AU$ 5,324
Verified Dealer
242
DE
Rolex Lady-Datejust 69173 Very good Gold/Steel 26mm Automatic
Rolex Oyster Perpetual Date Lady Stahl Gelbgold Automatik...
AU$ 6,574
Verified Dealer
1294
DE
Ulysse Nardin Marine Chronometer Manufacture 1185-126 Very good Steel 43mm Automatic
TOP
Ulysse Nardin Marine Chronometer 1185-126 Watch with 18k Rose...
AU$ 23,488
Free shipping
Verified Dealer
558
US
Rolex Day-Date 36 18238 Very good Yellow gold 36mm Automatic
Rolex Day-Date with original and rare "Pyramid" dial
AU$ 21,866
Verified Dealer
157
CH
Omega Seamaster Aqua Terra 220.12.41.21.01.001 New Steel 41mm Automatic
Omega Seamaster Aqua Terra 150M Co‑Axial Master Chronometer 41 mm
AU$ 6,164
Free shipping
Verified Dealer
1864
US
Tudor Black Bay GMT Very good Steel 41mm Automatic
Tudor Black Bay Gmt Automatic Cosc Ref.:79830/box
AU$ 5,455
Verified Dealer
896
PL
Breitling A45340211G1X2 New Steel 40mm Automatic
Breitling PREMIER AUTOMATIC DAY & DATE 40
AU$ 4,792
Verified Dealer
344
IT
Breitling Navitimer 01 (46 MM) AB012721/BD09 Very good Steel 46mm Automatic
Breitling Navitimer 01 (46 MM)
AU$ 7,761
Verified Dealer
197
FR
Ball Engineer II Arabic NM2026C-S4CAJ-SL New Steel Automatic Australia, Sydney
Ball Engineer II Arabic Chronometer White Dial NM2026C-S4CAJ-SL
AU$ 1,880
Verified Dealer
23
AU
Hublot Big Bang 44 mm 301.SB.131.RX Very good Steel 44mm Automatic Australia, Melbourne
Hublot Big Bang Titanium 301.SB.131.RX Carbon
AU$ 10,500
Private Seller
 
AU
Omega Seamaster Diver 300 M 21020422003001 New Steel 42mm Automatic
Omega Seamaster Blue Dial Men's Watch 210.20.42.20.03.001
AU$ 10,933
Free shipping
Verified Dealer
273
US
Omega Seamaster Aqua Terra 231.10.42.21.03.003 Very good Steel 41.5mm Automatic
Omega Seamaster Aqua Terra 231.10.42.21.03.003 Watch with...
AU$ 5,254
Free shipping
Verified Dealer
558
US
Omega Globemaster 130.33.41.22.02.001 New Steel 41mm Automatic Australia, Melbourne
Omega Globemaster Omega Co-Axial Master Chronometer
AU$ 10,114
Free shipping
Verified Dealer
32
AU
Omega De Ville Prestige 424.10.37.20.02.002 New Steel 36.8mm Automatic
Omega De Ville Prestige Co‑Axial 36.8 mm Automatic Silver Dial...
AU$ 3,985
Free shipping
Verified Dealer
1864
US
Sinn 103 103.0619 New Steel 41mm Automatic
TOP
Sinn 103 St Sa RB Classic Watch Sondermodell
AU$ 4,089
Verified Dealer
81
DE
Omega Speedmaster '57 331.10.42.51.01.002 New Steel 41.5mm Automatic
Omega SPEEDMASTER '57 OMEGA CO-AXIAL CHRONOGRAPH 41,5 MM
AU$ 9,839
Verified Dealer
344
IT
Rolex Cellini Time 50505 New Rose gold 39mm Automatic
Rolex Cellini Time 50505
AU$ 19,702
Verified Dealer
148
US
Ernest Borel GS9288-25321 New Steel 40mm Automatic Australia, Sydney
Ernest Borel Jules Borel COSC Automatic GS9288-25321
AU$ 2,000
Verified Dealer
23
AU
Rolex Sea-Dweller Deepsea 126660-0001 Unworn Steel 44mm Automatic Australia, Eden Hill
Rolex Sea-Dweller Deepsea
AU$ 21,000
Private Seller
 
AU
Breitling Superocean Héritage Chronograph A2337024.G753.154A Fair Steel Australia, Keysborough
Breitling Superocean Héritage Chronograph
AU$ 4,950
Verified Dealer
6
AU
Omega Constellation Day-Date 123.20.38.22.02.002 Very good Steel 38mm Automatic
Omega Constellation 123.20.38.22.02.002 Watch with 18k Yellow...
AU$ 8,113
Free shipping
Verified Dealer
558
US
Omega Seamaster Aqua Terra 231.10.42.21.03.003 New Steel 41.5mm Automatic Australia, Melbourne
Omega Seamaster Aqua Terra 150 M Omega Master Co-Axial 41.5 mm
AU$ 6,426
Free shipping
Verified Dealer
32
AU
Rolex Datejust Turn-O-Graph 1625 Good Steel 36mm Automatic Australia, Sydney
Rolex Datejust Turn-O-Graph
AU$ 4,900
Verified Dealer
 
AU
Rolex Oyster Perpetual Very good Yellow gold 31mm Automatic
Rolex Midsize 18K Solid Gold Oyster Perpetual 6050 Automatic,...
AU$ 9,248
Free shipping
Verified Dealer
595
US
Chopard Mille Miglia 168580-3001 New Steel 46mm Automatic
Chopard Mille Miglia
AU$ 11,106
Verified Dealer
344
IT
Rolex Day-Date 36 18238 Very good Yellow gold 36mm Automatic
Rolex Men's Rolex President - Day-Date Watch 18238 Black...
AU$ 19,934
Verified Dealer
158
US
Mido All Dial M8360.9.B1.1 New Steel 42mm Automatic Australia, Sydney
Mido COSC Automatic All Dial M8360.9.B1.1
AU$ 1,750
Verified Dealer
23
AU
Seiko Grand Seiko 6246-9001 Good Gold/Steel 36.5mm Automatic Australia, 7250
Seiko Grand Seiko
AU$ 3,750
Private Seller
 
AU
Omega Seamaster Diver 300 M 212.30.41.20.01.003 Very good Steel 41mm Automatic
Omega Seamaster Professional Co Axial 300m
AU$ 4,986
Verified Dealer
UK
Omega Constellation Ladies 123.10.31.20.55.001 Very good Steel 31mm Automatic
Omega Constellation 123.10.31.20.55.001 Watch with Stainless...
AU$ 4,636
Free shipping
Verified Dealer
558
US
Omega Seamaster Diver 300 M 210.30.42.20.03.001 New Steel 42mm Automatic Australia, Melbourne
Omega Seamaster Diver 300M Co-Axial Master Chronometer 42 mm
AU$ 6,826
Free shipping
Verified Dealer
32
AU
Omega De Ville Hour Vision 431.33.41.21.03.001 Very good Steel 41mm Automatic Australia, Sydney
Omega De Ville Hour Vision
AU$ 5,950
Verified Dealer
 
AU
Breitling Navitimer 01 AB012012/BB01/435X New Steel 43mm Automatic Australia, Sydney
Breitling Navitimer 01 AB012012/BB01/435X
AU$ 11,000
Verified Dealer
 
AU
Breitling Navitimer 1 B01 Chronograph 43 AB0121211B1P1 New Steel 43mm Automatic
Breitling Navitimer 1
AU$ 8,504
Verified Dealer
344
IT
Omega Constellation Ladies 127.20.27.20.52.001 New 27mm Automatic
Omega Constellation Co‑Axial Master Chronometer 27 mm Automati...
AU$ 9,565
Verified Dealer
635
JP
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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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