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Rolex Daytona 16523 Very good Gold/Steel 40mm Automatic
TOP
Rolex 2000 Rolex Daytona Zenith 40mm INVERTED 6 SIX Diamond...
฿429,209
Verified Dealer
543
US
Omega Seamaster Aqua Terra 220.10.34.20.53.001 New Steel 34mm Automatic
TOP
Omega Aqua Terra 150M Co-Axial Master Chronometer 34 mm
฿168,774
Free shipping
Verified Dealer
37
AU
Omega Constellation Men 123.10.38.21.06.001 New Steel 38mm Automatic
TOP
Omega 123.10.38.21.06.001 CONSTELLATION
฿128,783
Verified Dealer
19
HK
Omega Constellation Day-Date 123.25.38.22.02.001 New Gold/Steel 38mm Automatic
TOP
Omega 123.25.38.22.02.001 CONSTELLATION
฿367,274
Verified Dealer
19
HK
Breitling for Bentley AB0118A11L1X1 Unworn Steel Automatic Thailand, Bangkok
Breitling Premier Bentley Edition Racing Green
฿190,000
Private Seller
TH
Mido Multifort M005.431.11.441.00 Good Steel 42mm Automatic Thailand, Muang Nonthaburi
Mido Multifort
฿16,800
Private Seller
TH
Patek Philippe Nautilus 5712G-001 Very good White gold 40mm Automatic Thailand, Bangkok
Patek Philippe Nautilus
฿2,100,000
Private Seller
TH
Omega Constellation 167.005/6 Automatik Chronometer Very good Yellow gold 35mm Automatic
TOP
Omega Constellation 18K Gold Automatic Service 04/2020
฿285,699
Verified Dealer
538
DE
Glycine Combat 3945.004 Unworn Steel 43mm Automatic Thailand, Rawai
Glycine Combat Chrono 3945.15AT
฿42,293
Private Seller
TH
Omega Speedmaster HB-SIA 321.92.44.52.01.001 Very good Titanium 44,2mm Automatic
TOP
Omega Speedmaster HB-SIA Co-Axial GMT [SPECIAL OFFER]
฿175,925
Verified Dealer
1538
ES
Omega De Ville Co-Axial 1681057 Very good Rose gold 37mm Automatic
TOP
Omega De Ville Caliber 2500 Co-Axial Chronometer 18K 750 Rose...
฿119,786
Free shipping
Verified Dealer
677
NL
Ball Engineer II Magneto S NM3022C Very good Steel 42mm Automatic Thailand, Bangkok
Ball Engineer II Magneto S
฿107,359
Verified Dealer
20
TH
B.R.M MK44 New 44mm Automatic
TOP
B.R.M MK 44
฿235,997
Verified Dealer
53
FR
Sinn 103 103.0619 New Steel 41mm Automatic
TOP
Sinn 103 St Sa RB Classic Watch Sondermodell
฿87,605
Verified Dealer
103
DE
Breguet Classique 5140BA/12/9W6 New Yellow gold 40mm Automatic
TOP
Breguet Classique 40
฿385,038
Verified Dealer
46
CH
Tissot Touch T075.220.11.106.00 New Steel 39,5mm Quartz
TOP
Tissot Touch Solar Mother Diamond
฿27,140
Verified Dealer
165
ES
Rolex Submariner Date 16613T Very good Gold/Steel 40mm Automatic
Rolex Submariner Date 16613 Steel & Gold 2005
Price on request
Free shipping
Verified Dealer
452
ES
Omega Seamaster Aqua Terra 231.10.43.22.02.003 New Steel 43mm Automatic
Omega Aqua Terra Annual Calendar 43mm - 231.10.43.22.02.003
฿209,838
Verified Dealer
13
US
Jaeger-LeCoultre Geophysic True Second Q8012520 Very good Rose gold 39.6mm Automatic
TOP
Jaeger-LeCoultre Geophysic True Second
฿373,304
Verified Dealer
1538
ES
Chopard Mille Miglia 168588-3001 Very good Steel 39mm Automatic
TOP
Chopard Classic Racing Mill Automatic Chronograph Miglia - 16858
฿91,181
Free shipping
Verified Dealer
677
NL
Oris 634.7637.74.54MB Unworn Steel 47mm Automatic Thailand, Bangkok
Oris Diver 1000m automatic
฿55,306
Verified Dealer
20
TH
Omega Seamaster Planet Ocean 232.30.38.20.01.001 Very good Steel Automatic Thailand, Bangkok
Omega Seamaster Planet Ocean Automatic Co-Axial 8520
฿109,637
Verified Dealer
 
TH
Rolex Daytona 116515ln New Rose gold 40mm Automatic
Rolex Daytona
฿1,018,253
Verified Dealer
22
US
Chaumet Liens W23870-02A New Rose gold 33mm Automatic
TOP
Chaumet Liens 33
฿194,244
Verified Dealer
46
CH
Breitling Chronomat 44 GMT AB042011/BB56 Very good Steel 44mm Automatic
Breitling Chronomat 44 GMT
฿199,349
Verified Dealer
 
UK
Rolex Datejust 126334 Very good Steel 41mm Automatic
Rolex Date just 41 126334 LC100 rhodium like new box/papers TOP
฿357,214
Verified Dealer
37
DE
Omega Speedmaster Professional Moonwatch 311.92.44.51.01.007 New Ceramic 44.2mm Automatic
Omega Speedmaster - Dark Side of the Moon - DSOM
฿281,411
Free shipping
Verified Dealer
366
US
Omega Constellation Double Eagle 121.32.44.52.01.001 New Steel 44mm Automatic
TOP
Omega Constellation Double Eagle Day-Date Chrono (SPECIAL OFFER)
฿189,334
Verified Dealer
1538
ES
Omega De Ville Hour Vision 431.63.41.22.13.001 Very good Rose gold 41mm Automatic
Omega De Ville Hour Vision Annual Calendar Red Gold
฿497,024
Verified Dealer
23
FI
Omega 1687239 Very good Yellow gold 34mm Automatic Thailand, Bangkok
Omega Costellation
฿136,639
Verified Dealer
20
TH
Rolex Datejust 126334 Unworn 41mm Automatic
Rolex Datejust 41 Reference 126334
฿304,184
Verified Dealer
15
US
Rolex Submariner Date 16610 Very good Steel 40mm Automatic
Rolex Submariner Date 16610
฿259,413
Free shipping
Verified Dealer
555
UK
Breguet GJ24BB8548DDC3 New White gold Automatic
TOP
Breguet Secret de la Reine
฿1,641,143
Verified Dealer
46
CH
Omega Seamaster 168.1501 Very good Gold/Steel 36mm Automatic
Omega Seamaster
฿49,881
Verified Dealer
11
DE
Rolex Datejust 126334 Very good Steel 41mm Automatic
Rolex Datejust - Jubilee - 126334
฿341,597
Free shipping
Verified Dealer
6
US
Omega Seamaster Planet Ocean 215.30.44.21.01.001 New Steel 43.5mm Automatic
Omega Planet Ocean 8900 43.5mm Black - 2020 5 Year Omega...
฿161,852
Free shipping
Verified Dealer
366
US
Rolex Datejust 126334 Gold/Steel 41mm Automatic
Rolex 126334 Datejust 41 Wimbledon - White Gold Bezel Complete...
฿349,210
Free shipping
Verified Dealer
169
UK
Rolex GMT-Master II 116710LN Unworn Steel 40mm Automatic
Rolex GMT-Master II Pepsi Diamonds Baguette UNWORN
฿531,923
Verified Dealer
147
DE
Omega Seamaster Diver 300 M 22258000 Very good Steel 44mm Automatic Thailand, Bangkok
Omega Seamaster 300 diver
฿112,239
Verified Dealer
20
TH
Rolex Daytona 116520 New Steel 40mm Automatic
Rolex Daytona
฿829,594
Verified Dealer
22
US
Omega Seamaster Planet Ocean 2200.51.00 Good Steel 45.5mm Automatic
Omega Seamaster Planet Ocean
฿96,544
Verified Dealer
15
DE
Breguet Reine de Naples 8908BB/52/864.D00D New White gold Automatic
TOP
Breguet Reine de Naples
฿770,244
Verified Dealer
46
CH
Omega Seamaster Planet Ocean 232.30.46.21.01.001 Unworn Steel 45.5mm Automatic
Omega Planet Ocean Co-Axial Unworn
฿129,970
Verified Dealer
15
US
Rolex Datejust 126334 New Steel 41mm Automatic
Rolex Datejust - Diamond dial Oyster - 126334
฿338,344
Free shipping
Verified Dealer
6
US
Omega Seamaster Diver 300 M 210.30.42.20.03.001 New Steel 42mm Automatic
Omega Seamaster 300M - 42mm - Blue Wave Dial - Omega 5yr Warranty
฿138,266
Free shipping
Verified Dealer
366
US
Omega De Ville Hour Vision 431.33.41.21.02.001 Unworn Steel 41mm Automatic
Omega De Ville Hour Vision
฿150,180
Verified Dealer
15
NL
Rolex Milgauss 116400GV Very good Steel 40mm Automatic
Rolex Milgauss GV
฿221,694
Verified Dealer
1458
NL
Rolex Explorer II 16570 Very good Steel 40mm Automatic
Rolex Explorer Camouflage Kalaschnikow Engraved Graviert Unikat
฿393,221
Verified Dealer
147
DE
Rolex Daytona 116520 Very good Steel 40mm Automatic
Rolex Daytona 116520
฿556,741
Free shipping
Verified Dealer
555
UK
Omega Constellation 2852-3 Very good Gold/Steel 36mm Automatic
Omega Constellation vintage Pie Pan with cross hair dial
฿124,971
Verified Dealer
11
DE
Chaumet Liens W23871-02A New Rose gold 33mm Automatic
TOP
Chaumet Liens 33
฿261,236
Verified Dealer
46
CH
Breitling Super Avenger II A1337111.C871 New Steel 48mm Automatic
Breitling Super Avenger II
฿138,266
Verified Dealer
22
US
Omega Seamaster Planet Ocean 215.92.44.21.99.001 New Titanium 43.5mm Automatic
Omega Planet Ocean 600m Co-Axial Master Chronometer - 215.92.4...
฿213,873
Verified Dealer
13
US
Omega Speedmaster Professional Moonwatch Moonphase 304.33.44.52.03.001 New Steel Automatic
Omega Speedmaster Blue Moonphase - Chronometer
฿255,385
Free shipping
Verified Dealer
366
US
Omega Seamaster Aqua Terra 231.13.39.21.57.001 Omega Seamaster Aqua Terra, black MOP New Steel 38.5mm Automatic
Omega Seamaster Aqua Terra
฿196,664
Verified Dealer
15
NL
Rolex Daytona 116520 Good Steel 40mm Automatic
Rolex Daytona Steel White Dial
฿539,933
Verified Dealer
1458
NL
Rolex GMT-Master 1675 Very good Yellow gold 40mm Automatic
Rolex GMT Master Vintage Nipple Dial 18K Gold Box Papers Revision
฿2,429,982
Verified Dealer
147
DE
Rolex Submariner Date 116610LV Very good Steel 40mm Automatic
Rolex Submariner Hulk 116610LV
฿476,921
Free shipping
Verified Dealer
555
UK
Omega Seamaster Aqua Terra 220.10.41.21.03.001 Very good Steel 41mm Automatic
Omega Seamaster Aqua Terra 41mm- Blue dial- 2018 Box & Papers
฿131,662
Verified Dealer
108
UK
Rolex Sea-Dweller 126600 New Steel 43mm Automatic
Rolex Sea-Dweller 50th YEAR Anniversary 126600
฿455,301
Free shipping
Verified Dealer
5
US
Omega Seamaster Planet Ocean 232.63.46.21.01.001 Unworn Rose gold 45.5mm Automatic
Omega Seamaster Rose Gold Chronometer Reference 232.63.46.21.0...
฿471,730
Verified Dealer
15
US
Rolex Submariner Date 16613 Very good Gold/Steel 40mm Automatic
Rolex Submariner Date
฿277,373
Verified Dealer
 
UK
Omega Speedmaster Racing 329.30.44.51.04.001 New Steel Automatic
Omega Speedmaster Racing - White Dial - 2020 Omega 5 Year...
฿219,598
Free shipping
Verified Dealer
366
US

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.