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Omega Seamaster 300 233.32.41.21.01.001 Very good Steel 41mm Automatic
Omega Seamaster 007 James Bond "Spectre" Limitiert Automatik...
NZ$14,502
Sold by Chrono24
DE
Rado Sintra R13663162 Very good Ceramic Automatic New Zealand, Auckland
Rado Sintra
NZ$1,000
Private Seller
NZ
Omega Constellation Ladies 123.20.35.20.58.001 New Gold/Steel 35mm Automatic
TOP
Omega Constellation 123.20.35.20.58.001 CO‑AXIAL 35 MM
NZ$9,495
Professional dealer
880
US
Omega Constellation 168.005 Fair Gold/Steel 34.0mm Automatic
TOP
Omega Constellation Cal. 564
NZ$2,359
Professional dealer
18
US
Breitling Skyracer A2736303/B823 Very good Steel 43.5mm Automatic
TOP
Breitling Skyracer Reference #: A2736303/B823
NZ$6,056
Professional dealer
104
US
Breguet Reine de Naples 8967ST/V8/J50 New Steel 43mm Automatic
TOP
Breguet Reine de Naples, new, blue mother-of-pearl dial, blue...
NZ$16,820
Professional dealer
58
CH
Ulysse Nardin A.261 Good Steel 34mm Automatic
TOP
Ulysse Nardin Vintage Chronometer 36000
NZ$3,724
Professional dealer
36
CH
Zenith Star Zenith Good Yellow gold 35mm Manual winding
TOP
Zenith Star Chrono Manual Cal 146H Very Rare Tricompax Gold...
NZ$4,919
Professional dealer
170
IT
Cartier Santos 100 W20073X8 Very good Steel 41mm Automatic
TOP
Cartier Santos 100 Stainless Steel Iced Out Watch W20073X8
NZ$17,302
Professional dealer
834
US
Omega Speedmaster Professional Moonwatch 311.92.44.51.01.003 Very good Ceramic 44.5mm Automatic
Omega Speedmaster "Dark Side of the Moon" Ref. 311.92.44.51.01...
NZ$12,467
Sold by Chrono24
DE
Rolex Sea-Dweller 126600 Very good Steel 43mm Automatic New Zealand, Christchurch
Rolex Sea Dweller 43mm 50th Anniversary Mk 1 - 2017 Full Set -...
NZ$23,500
Private Seller
NZ
Chopard Mille Miglia 168459-3037 Very good Steel 44mm Automatic
TOP
Chopard Mille Miglia Gran Turismo Chrono Auto Historic...
NZ$9,244
Free shipping
Professional dealer
974
NL
Omega Constellation Day-Date 168.029 Good Gold/Steel 35mm Automatic
TOP
Omega Constellation Cal. 751 18K Gold Capped Vintage 1970
NZ$3,461
Professional dealer
18
US
Breitling Bentley B04 GMT NB0434E5/BE94 Unworn Carbon 45mm Automatic
TOP
Breitling Bentley GMT B04 S Carbon Body (Limited Edition; Only...
NZ$16,582
Professional dealer
104
US
Hublot Classic Fusion Ultra-Thin 545.NX.1270.LR New Titanium 42mm Manual winding
TOP
Hublot Classic Fusion ultra-thin, new, 42mm, titanium, manual...
NZ$11,678
Professional dealer
58
CH
Ulysse Nardin Marine Chronometer 41mm 263-66 Very good Steel 41mm Automatic
TOP
Ulysse Nardin Marine Chronometer 41 mm
NZ$5,376
Professional dealer
36
CH
Omega Constellation 167.021 Very good Steel 33mm Automatic
TOP
Omega Constellation Chronometer 1966
NZ$2,627
Professional dealer
163
HU
Cartier Santos 100 W20090X8 Very good Steel 41mm Automatic
TOP
Cartier Santos 100 Chronograph Stainless Steel Iced Out Watch...
NZ$23,070
Professional dealer
834
US
Rolex Submariner Date 16610T Very good Steel 40mm Automatic
Rolex Submariner Date Kermit Automatik Stahl Herrenuhr Ref....
NZ$28,750
Sold by Chrono24
DE
A. Lange & Söhne Unworn Rose gold 54mm Manual winding
TOP
A. Lange & Söhne für Krüssmann Brazilien 18k Gold Qualität 1A...
NZ$18,997
Free shipping
Professional dealer
30
DE
Omega Globemaster 130.33.41.22.02.001 Very good Steel 41mm Automatic
TOP
Omega Constellation Globemaster Annual Calendar
NZ$9,524
Professional dealer
193
SE
Rolex Sea-Dweller 126600 New Steel 43mm Automatic
Rolex Sea-Dweller | NEU | 2021 | FullSet | Red
NZ$24,934
Professional dealer
235
DE
Rolex GMT-Master II 16710 Very good Steel 40mm Automatic
Rolex GMT-Master II 16710 by Black Venom DLC P-Serie aus 2001
NZ$24,747
Professional dealer
124
DE
Omega Speedmaster Professional Moonwatch 311.92.44.51.01.003 Very good Ceramic 44.25mm Automatic
Omega Dark Side Of The Moon Speedmaster
NZ$13,964
Professional dealer
18
UK
Omega Speedmaster Professional Moonwatch 310.20.42.50.01.001 New Steel 42mm Manual winding
Omega Speedmaster Professional Moonwatch Apollo 11 50th -...
NZ$25,637
Professional dealer
109
AU
Breitling Navitimer 01 (46 MM) AB0127211B1X1 Very good Steel 46mm Automatic
Breitling Navitimer 01 (46 MM)
NZ$9,499
Professional dealer
398
DE
Rolex Daytona 16519 Very good White gold 40mm Automatic
Rolex UNIQUE Daytona 16519 zenith Glossular dial impossible to...
NZ$339,234
Professional dealer
6
AE
Breitling Airwolf A78363 Very good Steel 43.5mm Quartz
Breitling Airwolf Professional Chronometer Edelstahl Herrenuhr...
NZ$4,156
Sold by Chrono24
DE
Rolex Submariner Date 116610LV Very good Steel 40mm Automatic
Rolex Submariner 'Hulk'
NZ$34,911
Professional dealer
18
UK
Rolex Submariner Date 126610LN Unworn Steel 41mm Automatic
Rolex Submariner date 126610 41MM full set 2021 unworn
NZ$23,322
Professional dealer
53
FR

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.