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Louis Moinet Mechnograph Steel Blue Limited 12 pieces
AU$ 12,378
Verified Dealer
 
AE
TOP
Breitling Navitimer 1 B01 Chronograph 43
AU$ 9,392
Free shipping
Verified Dealer
192
US
TOP
Montblanc Timewalker Chronograph UTC Automatic
AU$ 3,990
Private Seller
 
AU
TOP
Bulova President 18kt Rose Gold Limited Edition
AU$ 7,999
Private Seller
 
AU
Rolex Sea-Dweller
AU$ 11,500
Verified Dealer
 
AU
Rolex Datejust Turn-O-Graph
AU$ 4,900
Verified Dealer
 
AU
Ulysse Nardin Marine Chronometer 43 mm
AU$ 12,339
Free shipping
Verified Dealer
16
AU
TOP
Breitling Chronomat 44 B01 Rose Gold Black Dial Black Alligato...
AU$ 19,965
Verified Dealer
780
BE
TOP
Rolex Datejust Pearlmaster 39, closing sale - o.p. 112.000 CHF
AU$ 108,401
Verified Dealer
28
CH
Rolex Datejust
AU$ 5,420
Private Seller
 
AU
Seiko Grand Seiko
AU$ 4,000
Private Seller
 
AU
TOP
Casio Gravitymaster GWR-B1000X-1AER LIm-Edition
AU$ 1,540
Verified Dealer
114
ES
Ball Engineer II Arabic Chronometer White Dial NM2026C-S4CAJ-SL
AU$ 1,880
Verified Dealer
17
AU
Ball Limited Edition AeroGMT II Men Watch DG2018C-S5C-BK
AU$ 3,950
Verified Dealer
5
AU
Rolex Datejust 36
AU$ 11,900
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AU
Ikepod Hemipode
AU$ 2,999
Private Seller
 
AU
Ulysse Nardin Marine Chronometer 41 MM
AU$ 11,256
Free shipping
Verified Dealer
16
AU
TOP
Rolex Lady-Datejust 28, closing sale - official price 15.800 CHF
AU$ 16,676
Verified Dealer
28
CH
TOP
Zenith Grande Class Grande Date Rattrapante, Split Second,...
AU$ 19,710
Verified Dealer
14
CH
TOP
Sinn Diving Watch U1 B
AU$ 3,031
Free shipping
Verified Dealer
289
LV
TOP
Girard Perregaux Equation Perpètuelle Ewiger Kalender Mondphas...
AU$ 6,078
Verified Dealer
1009
DE
TOP
Chopard Manufacture Caliber Mille Miglia 01.01-C GT XL 8565
AU$ 4,987
Verified Dealer
387
ES
Omega Seamaster Diver Chrono 300m Blue Waved Dial 2598.80
AU$ 3,600
Verified Dealer
38
AU
Ikepod Megapode
AU$ 5,390
Verified Dealer
 
AU
Omega Speedmaster Professional Moonwatch
AU$ 19,764
Private Seller
 
AU
Chopard L.U.C GMT One
AU$ 11,989
Free shipping
Verified Dealer
16
AU
TOP
Rolex Lady-Datejust, new, closing sale - official price 16.700...
AU$ 15,918
Verified Dealer
28
CH
Rolex Datejust ref. 116200 04/2013 art. Rz204
AU$ 7,943
Verified Dealer
370
IT
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Sinn 103 St Sa RB Classic Watch Sondermodell
AU$ 4,080
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62
DE
Rolex - Datejust 41 - 126334 - Blue Roman Dial - 41mm -...
AU$ 14,995
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33
AU
TOP
Omega Serviced Diamond Dial MOP Co-Axial Seamaster Aqua Terra...
AU$ 4,155
Verified Dealer
387
ES
Breitling Chronomat Windrider MOP Dial A13352
AU$ 3,750
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38
AU
Rolex Oyster Perpetual
AU$ 5,450
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AU
Hanhart “Calibre 40” MONO PUSHER CHRONOGRAPH 1940
AU$ 10,200
Private Seller
 
AU
Chopard G.P.M.H. Power Control
AU$ 11,523
Free shipping
Verified Dealer
16
AU
TOP
Tudor Black Bay Bronze 43, new
AU$ 5,299
Verified Dealer
28
CH
Hentschel H1 Chronometer White Gold / Steel, 39.5mm German...
AU$ 9,150
Verified Dealer
13
AU
Rolex Sea-Dweller - ref.126600 - Jahr: 2018 - LC137 Teil verklebt
AU$ 22,146
Verified Dealer
8
DE
Breitling Super Avenger II Black Dial A1337111/BC29SS
AU$ 6,495
Verified Dealer
33
AU
Omega Seamaster Aqua Terra
AU$ 8,995
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AU
Rolex Sea-Dweller
AU$ 25,000
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AU
Rolex Datejust Wimbledon 126334
AU$ 16,985
Verified Dealer
11
CH
Breitling Chronomat 44 Watch - Silver Dial and white inner...
AU$ 8,500
Private Seller
 
AU
Breitling Premier Chronograph 42
AU$ 7,210
Free shipping
Verified Dealer
16
AU
TOP
Rolex Lady-Datejust, new, closing sale - official price 24.900...
AU$ 22,740
Verified Dealer
28
CH
Omega Seamaster Planet Ocean 600M Chronograph
AU$ 8,784
Verified Dealer
12
EE
Breitling Chrono-Matic 49
AU$ 5,495
Verified Dealer
55
AT
Omega De Ville Co-Axil Chronoscope Stainless Steel 4850.50.31
AU$ 3,495
Verified Dealer
33
AU
Rolex GMT-Master Pepsi 1675
AU$ 42,583
Free shipping
Verified Dealer
430
UK
Breitling Super Avenger II
AU$ 6,000
Verified Dealer
 
AU
Rolex Datejust Jubilee 126334 Blue dial
AU$ 16,485
Verified Dealer
11
CH
Oris Carl Brashear Chronograph - Limited Edition
AU$ 5,800
Private Seller
 
AU
Chopard Mille Miglia GTS Power Control
AU$ 7,560
Free shipping
Verified Dealer
16
AU
TOP
Rolex Lady-Datejust Pearlmaster 29, closing sale, o.p. 78.400 CHF
AU$ 74,288
Verified Dealer
28
CH
Omega - PLANET OCEAN CO‑AXIAL
AU$ 7,365
Verified Dealer
 
DE
Rolex Datejust 41 126334
AU$ 15,095
Free shipping
Verified Dealer
164
US
Breitling - Chrono Matic 1461 - Stainless Steel - 50mm -...
AU$ 6,850
Verified Dealer
33
AU
Breitling Superocean Héritage II Chronographe
AU$ 5,950
Private Seller
 
AU
Ernest Borel Chronometer
AU$ 7,000
Private Seller
 
AU
Breitling Super Avenger II
AU$ 7,800
Verified Dealer
 
AU
Rolex Hulk Submariner 116610LV
AU$ 23,657
Free shipping
Verified Dealer
430
UK
Omega De Ville Prestige Co-Axial 32.7 mm
AU$ 4,762
Free shipping
Verified Dealer
16
AU
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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.