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Rolex Explorer 6610 Very good Steel 36mm Automatic
TOP
Rolex VINTAGE REF. 6610 EXPLORER GILT DIAL LOLLIPOP
฿518,322
Professional dealer
714
DE
Rolex Datejust 16019 Very good White gold 36mm Automatic
TOP
Rolex Datejust 16019 rare 18K Gold Weissgold White Herrenuhr...
฿2,410,398
Professional dealer
714
DE
Omega Seamaster Aqua Terra 2304.30.00 Unworn Gold/Steel 36mm Automatic
TOP
Omega Seamaster Aqua Terra
฿185,503
Professional dealer
128
CH
Breitling A45340241B1P1 Very good Steel 40mm Automatic Thailand, Samutprakarn
Breitling --------
฿79,000
Private Seller
TH
Rolex Datejust 126334 Very good Gold/Steel 41mm Automatic
Rolex Datejust 41 Stahl / Weissgold Automatik Herrenuhr Oyster...
฿371,665
Sold by Chrono24
DE
Glashütte Original Senator Hand Date 1-39-58-01-02-04 Unworn Steel 40mm Automatic Thailand, Bangkok
Glashütte Original Senator Hand Date
฿133,716
Private Seller
TH
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
฿191,488
Professional dealer
885
US
Breitling Bentley B04 GMT NB0434E5/BE94 Unworn Carbon 45mm Automatic
TOP
Breitling Bentley GMT B04 S Carbon Body (Limited Edition; Only...
฿394,291
Professional dealer
106
US
Ulysse Nardin Marine Chronometer 41mm 263-66 Very good Steel 41mm Automatic
TOP
Ulysse Nardin Marine Chronometer 41 mm
฿127,997
Professional dealer
36
CH
Omega Constellation 167.021 Very good Steel 33mm Automatic
TOP
Omega Constellation Chronometer 1966
฿62,239
Professional dealer
165
HU
Heuer Good 38mm Manual winding
TOP
Heuer Super sport 1975 48 mm Super Retro Watch Sports
฿17,880
Free shipping
Professional dealer
976
NL
Rolex Sea-Dweller 126600 New Steel 43mm Automatic Thailand, Nakhon Sawan
Rolex Sea-Dweller New Full Set 126600
฿530,000
Professional dealer
39
TH
Cartier Santos 100 W20073X8 Very good Steel 41mm Automatic
TOP
Cartier Santos 100 Stainless Steel Iced Out Watch W20073X8
฿411,400
Professional dealer
834
US
Omega De Ville Co-Axial 168.1700 Very good Steel 37.5mm Automatic
Omega De Ville Co-Axial Chronometer Automatik Edelstahl...
฿86,387
Sold by Chrono24
DE
Omega 12200911 Good Gold/Steel 35.0mm Automatic Thailand, Chiang Mai
Omega Automatic Chronometer, Cal. 352RG bumper, 2637-1 CAP...
฿44,572
Private Seller
TH
Rolex Oyster Perpetual 34 Very good Gold/Steel 34mm Automatic
TOP
Rolex Mens Rolex Oyster Perpetual 1024 34mm Gold-Capped...
฿171,945
Professional dealer
860
US
Breitling Skyracer A2736303/B823 Very good Steel 43.5mm Automatic
TOP
Breitling Skyracer Reference #: A2736303/B823
฿144,002
Professional dealer
106
US
Ulysse Nardin A.261 Good Steel 34mm Automatic
TOP
Ulysse Nardin Vintage Chronometer 36000
฿88,671
Professional dealer
36
CH
A. Lange & Söhne Unworn Rose gold 54mm Manual winding
TOP
A. Lange & Söhne für Krüssmann Brazilien 18k Gold Qualität 1A...
฿450,016
Free shipping
Professional dealer
30
DE
Mido All Dial 8330 Good Steel 38mm Automatic Thailand, Bangkok
Mido All Dial AD1 Automatic Unisex Size 38 mm. (Fullset) |...
฿37,029
Professional dealer
33
TH
Breitling Chronomat HB0140AA/A723 Very good Rose gold 41mm Chronograph
Breitling Chronomat Timepiece
฿840,012
Professional dealer
21
US
Cartier Santos 100 W20090X8 Very good Steel 41mm Automatic
TOP
Cartier Santos 100 Chronograph Stainless Steel Iced Out Watch...
฿548,545
Professional dealer
834
US
Tudor Black Bay Bronze 79250B Very good Bronze 43mm Automatic
Tudor Heritage Black Bay 43 Bronze Chronometer Automatik...
฿134,603
Sold by Chrono24
DE
Breitling Super Avenger II A1337111/BC28/168A Very good Steel 48mm Automatic Thailand, Bangkok
Breitling Super Avenger II
฿125,000
Private Seller
TH
Omega Seamaster Planet Ocean 232.30.42.21.01.003 New Steel 42mm Automatic
TOP
Omega Seamaster Ocean Planet Automatic 232.30.42.21.01.003
฿180,281
Professional dealer
127
JP
Rolex Datejust 126334 New Steel 41mm Automatic
Rolex Datejust 41 | LC100 | NEU | 08/2021 | FullSet
฿498,232
Professional dealer
237
DE
Omega Seamaster Planet Ocean 232.32.42.21.01.005 Very good Steel 42mm Automatic
Omega Seamaster Planet Ocean 600m Co-Axial - 42 mm
฿180,408
Professional dealer
53
FR
Omega Speedmaster Professional Moonwatch 310.20.42.50.01.001 New Steel 42mm Manual winding
Omega Speedmaster Professional Moonwatch Apollo 11 50th -...
฿604,005
Professional dealer
111
AU
TAG Heuer Grand Carrera Very good Steel 40mm Automatic Thailand, Bangkok
TAG Heuer Grand Carrera
฿80,915
Professional dealer
33
TH
Ebel 1911 BTR E9137L73 Good Steel 44.5mm Automatic
Ebel 1911 Chronograph
฿144,002
Professional dealer
21
US
Tudor Black Bay 79230N Very good Steel 41mm Automatic
Tudor Black Bay
฿126,567
Professional dealer
402
DE
Omega Constellation Men 123.50.38.21.02.001 Very good Yellow gold 38mm Automatic
Omega Constellation 18K Gold Co-Axial Herrenuhr 123.50.38.21.0...
฿580,601
Sold by Chrono24
DE

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.