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Omega Constellation Constellation Manhattan Very good Steel 35mm Automatic
TOP
Omega Constellation Manhattan Vintage 1985 Auto Chronometer...
฿58,970
Professional dealer
56
US
Ball DG3030B-S2C-BK New Titanium 40mm Automatic
TOP
Ball DG3030B-S2C-BK Roadmaster Marine GMT LIMITED EDITION Watch
฿80,878
Professional dealer
314
US
Rolex Datejust Oysterquartz 17013 Very good Steel 36mm Quartz
TOP
Rolex Oysterquartz Datejust 17013 18k Solid Yellow Gold & SS...
฿174,109
Professional dealer
US
Rolex Submariner Date 126619LB Unworn White gold 41mm Automatic
TOP
Rolex Submariner Date Black 41 mm dial White Gold 126619LB...
฿1,603,056
Professional dealer
1385
BE
Seiko 5 Sports 6138-0011 Good Steel 44mm Automatic Thailand, Muang District
Seiko 5 Sports [RARE] Early JDM Version w/ original strap,...
฿23,000
Private Seller
TH
Breitling Chronomat Colt A17313101F1A1 Very good Steel 41mm Automatic Thailand, Bangkok
Breitling Chronomat Colt
฿72,180
Private Seller
TH
Bremont V4/RR Very good Steel 43mm Automatic Thailand, Banglamung
Bremont Norton
฿186,557
Private Seller
TH
Omega Speedmaster Professional Moonwatch 310.20.42.50.01.001 Very good Gold/Steel 42mm Manual winding
Omega Speedmaster Moonwatch Apollo 11 50th Anniversairy Ref....
฿446,970

Sold by Chrono24

DE
Bremont Supermarine S300/BL/BR New Steel 40mm Automatic
TOP
Bremont Supermarine S300/BL/BR Men's Automatic Blue Dial...
฿133,655
Professional dealer
314
US
Omega Constellation Day-Date 168.029 Good Yellow gold 35mm Automatic
TOP
Omega Constellation Automatic Chronometer Cal. 751
฿107,273
Professional dealer
63
ES
Rolex Yacht-Master II 116688-0002 New Yellow gold 44mm Automatic
Rolex Yacht-Master II Yellow Gold (New Full Set)
฿1,513,814
Free shipping
Professional dealer
12
HK
Rolex Datejust 126334 Unworn Steel 41mm Automatic
Rolex Datejust 41, blaues Blatt/blue Dial, 126334, Oyster aus...
฿424,338
Professional dealer
10
DE
Rolex GMT-Master II 126710BLNR Very good Steel 40mm Automatic
Rolex 126710BLNR GMT-Master II Batman Jubilee - 4 Year Rolex...
฿639,099
Free shipping
Professional dealer
226
UK
Ball Engineer M NM2032C-S1CJ-BE New Steel 40mm Automatic
TOP
Ball Engineer M Marvelight (40mm) NM2032C-S1CJ-BE
฿67,340
Free shipping
Professional dealer
118
JP
Rolex Sea-Dweller 126603 Very good Gold/Steel 43mm Automatic
Rolex Sea-Dweller 2019 FULL SET
฿615,052
Professional dealer
51
UK
Breitling Colt A74380 Very good Steel 41mm Quartz
Breitling Colt Chronometer 500M Datum Edelstahl Herrenuhr Ref....
฿62,236

Sold by Chrono24

DE
Rolex Explorer 114270 Very good Steel 36mm Automatic
Rolex Explorer I 114270 Black (36938)
฿216,275
Professional dealer
676
US
Omega Seamaster Diver 300 M 210.22.42.20.01.004 Very good Steel 42mm Automatic
Omega Seamaster Diver 300M 42 MM James Bond 007 LE 210.22.42.2...
฿311,031
Professional dealer
8
US
Rolex Submariner Date 126610LN New Steel 41mm Automatic
Rolex Submariner Date 41mm Black Dial 2020 New Model (New Full...
฿481,468
Free shipping
Professional dealer
12
HK
Rolex Submariner Date 126610LN Unworn Steel 41mm Automatic
Rolex Submariner Date 41mm neu/ungetragen aus 02/2021
฿514,864
Professional dealer
10
DE
Omega Seamaster Diver 300 M 21022422001004 Steel 42mm
Omega 21022422001004 Seamaster Diver 300M - Co-Axial - James...
฿318,466
Free shipping
Professional dealer
226
UK
Ball Engineer Hydrocarbon Nedu DC3026A-S3CJ-BE New Titanium 42mm Automatic
TOP
Ball Engineer Hydrocarbon NEDU
฿117,112
Free shipping
Professional dealer
118
JP
Rolex Day-Date 36 1803 Good Yellow gold 36mm Automatic
Rolex Day-Date 36 Circa 1971
฿454,735
Professional dealer
51
UK
Omega Seamaster Aqua Terra 231.23.44.50.06.001 Very good Gold/Steel 44mm Automatic
Omega Seamaster Aqua Terra 150M Stahl / Gold Automatik Ref....
฿175,393

Sold by Chrono24

DE
Rolex Submariner Date 16610T 40mm Automatic
Rolex Submariner
฿335,699
Professional dealer
248
DE
Rolex Sea-Dweller 126600 Unworn Steel 43mm Automatic
Rolex Sea-Dweller Single Red - TEILVERKLEBT/UNGETRAGEN - 2020...
฿546,925
Professional dealer
106
DE
Omega Seamaster Planet Ocean 215.30.44.21.03.001 Very good Steel 43.5mm Automatic
Omega Seamaster Blue Planet Ocean 43.5 MM Men’s Watch 215.30.4...
฿155,438
Professional dealer
8
US
Omega Seamaster Diver 300 M 210.22.42.20.01.002 New Gold/Steel 42mm Automatic
Omega Seamaster Diver 300M Co-Axial Master Chronometer 42 mm...
฿186,569
Free shipping
Professional dealer
12
HK
Rolex Datejust 126334 Unworn Steel 41mm Automatic
Rolex Datejust 41 schwarz/black, Oyster 126334 aus 2021,...
฿424,338
Professional dealer
10
DE
Omega Speedmaster 31020425001001 Steel 42mm Manual winding
Omega 31020425001001 Speedmaster Limited Edition Apollo 11 -...
฿476,400
Free shipping
Professional dealer
226
UK
Ball Engineer Hydrocarbon Spacemaster DM2036A-SCAJ-WH New Steel 41.5mm Automatic
TOP
Ball Engineer Hydrocarbon Spacemaster
฿82,564
Free shipping
Professional dealer
118
JP
Rolex Submariner Date 16610LV Unworn Steel 40mm Automatic
Rolex Submariner Green Bezel NOS Full set RRR
฿779,701
Professional dealer
51
UK
Omega Seamaster Planet Ocean 232.92.46.21.03.001 Very good Titanium 45.5mm Automatic
Omega Seamaster Planet Ocean Automatik Titan Ref. 232.92.46.21...
฿186,709

Sold by Chrono24

DE
Jaeger-LeCoultre Geophysic 1958 37171 Very good Steel Automatic
Jaeger-LeCoultre Geophysic 1958 SS Limited (37171)
฿308,075
Professional dealer
676
US
Rolex Datejust 126334 New Steel 41mm Automatic
Rolex Datejust 41 - WIMBLEDON DIAL - NEW 2021
฿471,487
Professional dealer
106
DE
Rolex Submariner Date 126610LN New Steel 41mm Automatic
Rolex Submariner Date 41 new
฿486,575
Professional dealer
156
ES
Omega Seamaster Aqua Terra 220.10.41.21.03.002 New Steel 41mm Automatic
Omega Aqua Terra 150M Co-Axial Master Chronometer 41MM (New...
฿160,489
Free shipping
Professional dealer
12
HK
Rolex Day-Date 18248 Very good Yellow gold 36mm Automatic
Rolex Day-Date President W/h Diamond Bezel
฿559,981
Professional dealer
 
US
Rolex Datejust 126334 Steel 41mm Automatic
Rolex 126334 Datejust 41 Wimbledon - Rolex International Warranty
฿431,121
Free shipping
Professional dealer
226
UK
Ball Engineer II NM3060C-PCJ-GY New 45mm Automatic
TOP
Ball Engineer II Volcano
฿93,690
Free shipping
Professional dealer
118
JP
Rolex Yacht-Master II 116680 Very good Steel 44mm Automatic
Rolex Yacht-Master II 2015 Mint Condition
฿584,721
Professional dealer
51
UK
Breitling Chronomat 44 GMT AB042011 Very good Steel 44mm Automatic
Breitling Chronomat 44 GMT Chronograph Automatik Stahl...
฿205,568

Sold by Chrono24

DE
Ball Engineer II Magneto S NM3022C Very good Steel 42mm Automatic Thailand, Bangkok
Ball Engineer II Magneto S
฿102,692
Professional dealer
27
TH
Rolex Datejust 126334 New Steel 41mm Automatic
Rolex Datejust 41 - WHITE DIAL - NEW 2021
฿433,768
Professional dealer
106
DE
Rolex Datejust 126334 New Steel 41mm Automatic
Rolex Datejust 41 Wimbledon Jubile NEW
฿433,768
Professional dealer
156
ES
Omega Speedmaster Professional Moonwatch Moonphase 304.93.44.52.03.002 New Ceramic 44.25mm Automatic
Omega Speedmaster Moonwatch Co-Axial Master Moonphase Chronogr...
฿427,302
Free shipping
Professional dealer
12
HK
Rolex GMT-Master II 116710BLNR New Steel 40mm Automatic
Rolex GMT-Master II - "Batman" - NEW CARD - NEW - 2021 - RARE...
฿712,511
Professional dealer
196
DE
Laurent Ferrier FBN916.01 Rose gold 40.5mm Manual winding
Laurent Ferrier FBN916.01 Galet Classic Tourbillon - Enamel...
฿3,141,334
Free shipping
Professional dealer
226
UK
Ball Engineer Hydrocarbon Nedu DC3026A-SCJ-BK New Titanium 42mm Automatic
TOP
Ball Engineer Hydrocarbon NEDU
฿117,112
Free shipping
Professional dealer
118
JP
Rolex GMT-Master II 126711CHNR Unworn Gold/Steel 40mm Automatic
Rolex GMT-Master II 2020 UNWORN
฿671,379
Professional dealer
51
UK
Breitling Bentley 6.75 A44362 Very good Steel 48.5mm Automatic
Breitling Bentley 6.75 Chronograph Automatik Stahl Herrenuhr...
฿167,849

Sold by Chrono24

DE
Rolex Daytona 16528G Very good Yellow gold 40mm Automatic
Rolex Daytona
฿1,376,743
Professional dealer
8
IT
Omega Seamaster Diver 300 M 210.30.42.20.01.001 New Steel 42mm Automatic
Omega Seamaster Diver 300 M Black Dial NEW 2021
฿190,481
Professional dealer
106
DE
Rolex Sea-Dweller 126600 New Steel 43mm Automatic
Rolex Sea-Dweller Red Writing
฿528,966
Professional dealer
26
CA
Omega Seamaster Diver 300 M 210.62.44.51.01.001 New Rose gold 44mm Automatic
Omega Seamaster Diver 300M Co-Axial Master Chronometer...
฿794,422
Free shipping
Professional dealer
12
HK
Rolex GMT-Master II 126710BLRO Very good Steel 40mm Automatic
Rolex GMT-Master II - Pepsi - New Condition - B&P - FULLSET -...
฿663,477
Professional dealer
196
DE
Rolex Daytona 116520 Steel 40mm Automatic
Rolex 116520 Cosmograph Daytona Chromalight APH - New Old Stock
฿1,115,715
Free shipping
Professional dealer
226
UK
Ball Engineer Hydrocarbon DM2276A-S3CJ-BK New Steel 42mm Automatic
TOP
Ball Engineer Hydrocarbon Submarine Warfare Blue PVD
฿77,587
Free shipping
Professional dealer
118
JP
Rolex Submariner Date 16610 Fair Steel 40mm Automatic
Rolex Submariner Date Vintage Beautiful Patina Unpolished
฿519,728
Professional dealer
51
UK
Omega Speedmaster 324.28.38.50.02.002 Very good Gold/Steel 38mm Automatic
Omega Speedmaster 38 Chronograph Stahl / Gold Ref. 324.28.38.5...
฿273,463

Sold by Chrono24

DE
Rolex Datejust 126334 New Steel 41mm Automatic
Rolex Datejust Diamond dial
฿467,715
Professional dealer
8
IT

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.


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