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Seiko King 5256-8010 Good Steel 36mm Automatic Thailand, Muang District
Seiko King 5256-8010. A very RARE timepiece. The last King Seiko.
฿40,000
Excl. shipping
Private Seller
TH
Breitling Bentley Motors A25362 Very good Steel 49mm Automatic
Breitling Bentley Motors Chonograph Automatik Edelstahl...
฿197,871
+ ฿6,088 for shipping
Sold by Chrono24
DE
Tudor Black Bay Fifty-Eight M79010SG-0001 New Silver 39mm Automatic Thailand, Bangkok
Tudor Black Bay Fifty-Eight 925
฿155,000
+ ฿700 for shipping
Professional dealer
TH
Mido All Dial 8330 Good Steel 38mm Automatic Thailand, Bangkok
Mido All Dial AD1 Automatic Unisex Size 38 mm. (Fullset) |...
฿36,825
+ ฿1,364 for shipping
Professional dealer
4.76 (27)
TH
Rolex Sea-Dweller Deepsea 126660 Unworn Steel 44mm Automatic
Rolex Sea-Dweller Deepsea 2021 Complete Set UNWORN
฿581,955
+ ฿3,767 for shipping
Professional dealer
4.96 (55)
UK
Rolex Datejust 41 126334 New Steel 41mm Automatic
Rolex Datejust 41 | NEW 2021
฿502,288
+ ฿5,670 for shipping
Professional dealer
4.88 (23)
NL
Rolex Datejust 41 126334 Very good Steel 41mm Automatic
Rolex Datejust 41 Wimbledon Dial 126334 Jubilee Bracelet White...
฿622,152
+ ฿18,265 for shipping
Professional dealer
4.80 (7)
IT
Rolex Daytona 16528 Unworn Yellow gold 40mm Automatic
Rolex Zenith Daytona 750 Gold 16528 MOP Perlmutt Diamanten...
฿3,038,460
+ ฿6,279 for shipping
Professional dealer
4.93 (121)
DE
Rolex Submariner Date 16610 COMEX M Very good Steel 40mm Automatic
Rolex Submariner 16610 COMEX M series full set 2008
฿3,614,950
+ ฿22,831 for shipping
Professional dealer
4.92 (27)
MC
Omega 12200911 Good Gold/Steel 35.0mm Automatic Thailand, Chiang Mai
Omega Automatic Chronometer, Cal. 352RG bumper, 2637-1 CAP...
฿44,326
Excl. shipping
Private Seller
TH
Omega Seamaster Planet Ocean Chronograph 2210.50.00 Very good Steel 45.5mm Automatic
Omega Seamaster Planet Ocean Chronograph Automatik Stahl...
฿131,280
+ ฿3,425 for shipping
Sold by Chrono24
DE
Rolex Sea-Dweller 4000 116600 Very good Steel 40mm Automatic
Rolex Sea-Dweller 4000 aus 2014 Ceramic neuer Service
฿532,539
+ ฿7,572 for shipping
Professional dealer
4.91 (250)
DE
Ball Engineer II Magneto S NM3022C-N1CJ-BK Unworn Steel 42mm Automatic Thailand, Bangkok
Ball Engineer Ii Magneto S
฿118,657
+ ฿1,364 for shipping
Professional dealer
4.76 (27)
TH
Rolex Submariner Date 16610 Fair Steel 40mm Automatic
Rolex Submariner Date Vintage Beautiful Patina Unpolished
฿547,494
+ ฿3,767 for shipping
Professional dealer
4.96 (55)
UK
Rolex GMT-Master 1675 Good Steel 40mm Automatic
Rolex GMT-Master Pepsi 1675 Mark 3 Radial Dial Jubilee Serial...
฿1,178,055
+ ฿27,169 for shipping
Professional dealer
4.94 (147)
DE
Rolex Submariner Date 126610LN New Steel 41mm Automatic
Rolex Submariner Date | LC100 | NEU | 2021 | FullSet
฿650,691
+ ฿11,416 for shipping
Professional dealer
4.96 (249)
DE
Rolex Submariner (No Date) 124060 New Steel 41mm Automatic
Rolex Submariner NO Date NEW 2021
฿551,755
+ ฿3,805 for shipping
Professional dealer
4.80 (86)
CH
Rolex Submariner Date 16610 Very good Steel 40mm Automatic
Rolex Submariner 16610 military NATO 1994 S series
฿1,331,824
+ ฿22,831 for shipping
Professional dealer
4.92 (27)
MC
Omega Seamaster Diver 300 M 210.22.42.20.01.001 Very good Gold/Steel 42mm Automatic Thailand, Bangkok
Omega Seamaster Diver 300 M
฿180,000
Excl. shipping
Private Seller
TH
Tudor Black Bay Bronze 79250B Very good Bronze 43mm Automatic
Tudor Heritage Black Bay 43 Bronze Chronometer Automatik...
฿119,864
+ ฿3,425 for shipping
Sold by Chrono24
DE
Rolex Sea-Dweller 126603 Very good Gold/Steel 43mm Automatic
Rolex Sea-Dweller full Set 2019 Steel Gold
฿684,748
+ ฿7,572 for shipping
Professional dealer
4.91 (250)
DE
TAG Heuer Grand Carrera Very good Steel 40mm Automatic Thailand, Bangkok
TAG Heuer Grand Carrera
฿80,469
+ ฿1,364 for shipping
Professional dealer
4.76 (27)
TH
Rolex Yacht-Master 37 268622 Very good Steel 37mm Automatic
Rolex Yacht-Master 37 2019 Model Mint
฿467,846
+ ฿3,767 for shipping
Professional dealer
4.96 (55)
UK
Rolex Daytona 116520 Very good Steel 40mm Automatic
Rolex Daytona Citrus Lemon Dial Super Rare LC100 Collectors...
฿6,849,378
+ ฿90,564 for shipping
Professional dealer
4.94 (147)
DE
Rolex Submariner Date 126610LN New Steel 41mm Automatic
Rolex Submariner Date | LC100 | NEU | 2021 | FullSet
฿643,080
+ ฿11,416 for shipping
Professional dealer
4.96 (249)
DE
Rolex Submariner Date 16610 T Very good Steel 40mm Automatic
Rolex Submariner Date 2008 Full Set
฿513,703
+ ฿3,805 for shipping
Professional dealer
4.80 (86)
CH
Rolex Submariner (No Date) 124060 New Steel 41mm Automatic
Rolex NEW 2021 - Submariner No Date 124060
฿540,340
+ ฿9,513 for shipping
Professional dealer
4.99 (55)
FR
Breitling Chronomat A 13050 Good Steel 39mm Automatic Thailand, BangPlee
Breitling Chronomat 10th anniversary special edition
฿75,000
Excl. shipping
Private Seller
TH
Omega Seamaster Diver 300 M 212.30.41.20.03.001 Very good Steel 41mm Automatic
Omega Seamaster Diver 300M Co-Axial Herrenuhr Ref. 212.30.41.2...
฿131,280
+ ฿3,425 for shipping
Sold by Chrono24
DE
Omega Seamaster 300 234.10.39.20.01.001 Very good Steel 39mm Automatic
Omega Seamaster 300 Trilogy 1957 lim. Ed. full set 5 times...
฿275,878
+ ฿7,572 for shipping
Professional dealer
4.91 (250)
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.