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TOP
Breitling Crosswind Racing 18K/SS Special Mother of Pearl Dial
฿145,773
Free shipping
Verified Dealer
179
US
TOP
Omega 424.58.40.20.52.001 DE VILLE
฿412,631
Verified Dealer
10
HK
TOP
Omega 123.10.38.21.06.001 CONSTELLATION
฿117,072
Verified Dealer
10
HK
TOP
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฿152,138
Verified Dealer
AE
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฿2,298,836
Verified Dealer
27
CH
TOP
Omega Seamaster Planet Ocean gmt master chronometer
฿155,000
Private Seller
TH
TAG Heuer Grand Carrera Caribre6
฿86,936
Verified Dealer
TH
TOP
Rolex LADY PEARLMASTER DATEJUST MASTERPIECE GOLD DIAMANT DIAMOND
฿516,428
Verified Dealer
371
DE
TOP
Chopard L.U.C Pro One Diver black dial 42,5 - TOP CONDITION
฿111,967
Free shipping
Verified Dealer
446
NL
TOP
Sinn 103 St Sa RB Classic Watch Sondermodell
฿84,406
Verified Dealer
61
DE
Omega Speedmaster Broad Arrow 321.10.42.50.01.001 Watch with...
฿105,565
Free shipping
Verified Dealer
398
US
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฿247,706
Verified Dealer
 
DE
Breitling Avenger II GMT A3239011
฿94,087
Verified Dealer
236
DE
TOP
Breguet Marine 35, official price 19.000 CHF
฿409,356
Verified Dealer
27
CH
Rolex Daytona Platinum Diamond 40mm Watch 116576TBR
฿4,967,744
Free shipping
Verified Dealer
190
US
Ball Engineer II Magneto S
฿102,460
Verified Dealer
TH
Rolex Datejust 41mm 126334 Blue Index 2019 B&P
฿284,871
Verified Dealer
146
US
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฿194,996
Verified Dealer
5400
DE
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฿266,999
Verified Dealer
11
DE
Rolex Sea-Dweller
฿263,913
Verified Dealer
 
US
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฿116,791
Verified Dealer
88
MC
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฿315,231
Verified Dealer
1163
NL
TOP
Rolex Lady-Datejust 26, official price 24.200 CHF
฿519,576
Verified Dealer
27
CH
Rolex Datejust 41 Steel & White Gold Black Diamond Jubilee 126334
฿341,504
Free shipping
Verified Dealer
190
US
Panerai Radiomir Rattrapante
฿242,179
Verified Dealer
TH
Rolex Datejust 41 126334
฿305,829
Verified Dealer
146
US
Rolex Day-Date 40mm Rose Gold President White Roman Dial
฿915,934
Free shipping
Verified Dealer
12
US
Rolex Early Day-Date from 1961
฿266,999
Verified Dealer
11
DE
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฿297,228
Verified Dealer
 
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฿1,324,661
Verified Dealer
551
NL
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฿1,226,420
Verified Dealer
342
US
TOP
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฿771,506
Verified Dealer
27
CH
Rolex Datejust 41mm Stainless Steel Blue Diamond Dial Watch...
฿325,979
Free shipping
Verified Dealer
190
US
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฿335,325
Verified Dealer
TH
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฿315,143
Verified Dealer
146
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฿198,441
Verified Dealer
 
DE
Rolex Early Datejust Turn-O-Graph from 1959
฿198,096
Verified Dealer
11
DE
Rolex Datejust 36
฿377,244
Verified Dealer
5400
DE
Rolex Day-Date 36 diamond from 2011 with B + P NEW ROLEX SERVICE
฿652,856
Verified Dealer
551
NL
Chopard 8954 Limited Edition 2004 Mille Miglia Chrono GMT (32484)
฿100,908
Verified Dealer
342
US
TOP
Breguet Reine de Naples, official price 33.000 CHF
฿724,269
Verified Dealer
27
CH
Rolex Sea-Dweller Red 43mm Stainless Steel Watch 126600
฿465,698
Free shipping
Verified Dealer
190
US
Omega seamaster 600m co-axial
฿90,041
Verified Dealer
TH
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฿448,652
Verified Dealer
146
US
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฿142,974
Verified Dealer
 
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฿163,645
Verified Dealer
11
DE
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฿292,803
Verified Dealer
510
DE
Rolex Datejust Steel 41 Black Dial Jubilee 126334
Price on request
Free shipping
Verified Dealer
12
US
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฿742,062
Verified Dealer
342
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TOP
Rolex Lady-Datejust, official price 24.900 CHF
฿535,321
Verified Dealer
27
CH
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฿304,245
Free shipping
Verified Dealer
190
US
Omega Seamaster 300 diver
฿107,118
Verified Dealer
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฿306,760
Verified Dealer
146
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฿125,059
Verified Dealer
 
DE
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฿129,193
Verified Dealer
11
DE
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฿96,480
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UK
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฿153,691
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฿271,675
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฿251,899
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27
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฿1,769,739
Free shipping
Verified Dealer
190
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฿301,451
Free shipping
Verified Dealer
670
DE
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฿304,276
Verified Dealer
146
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฿113,001
Verified Dealer
 
DE
Omega Seamaster Diver 300M Black Dial 212.30.41.20.01.003
฿86,781
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301
US
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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.