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Omega Constellation Very good 35mm Automatic
TOP
Omega Constellation Automatic Chronometer 18k Solid Gold Half...
S$ 2,697
Free shipping
Verified Dealer
44
US
Jaeger-LeCoultre LeCoultre-Kaliber 42 – RMPS Präzisionsuhrwerk Minuten Rep. Very good Red gold 52mm Manual winding
TOP
Jaeger-LeCoultre Taschenuhr 35 Steine, 18k, Minuten repetition...
S$ 12,527
Free shipping
Verified Dealer
21
DE
Rolex Datejust Very good 36mm Quartz
TOP
Rolex Datejust 1630 "Rare Bird" Vintage 1975 18k Solid Gold SS...
S$ 11,377
Free shipping
Verified Dealer
44
US
Rolex Day-Date 36 118348 New Yellow gold 36mm Automatic
TOP
Rolex Day-Date 36
S$ 48,366
Verified Dealer
49
CH
Vacheron Constantin Overseas Chronograph 49150/B01A-9095 Unworn Steel 42mm Automatic
TOP
Vacheron Constantin Overseas Chronograph ungetragen NOS Full...
S$ 33,372
Verified Dealer
155
DE
Panerai Luminor Power Reserve PAM 27 Very good Steel 44mm Automatic Singapore, Singapore
Panerai Luminor Power Reserve PAM27
S$ 9,850
Verified Dealer
14
SG
Omega Seamaster Planet Ocean 232.32.42.21.01.005 Very good Steel 42mm Automatic Singapore, Singapore
Omega Seamaster Planet Ocean 600M Co-Axial 42mm 232.32.42.21.0...
S$ 4,550
Verified Dealer
 
SG
Rolex Bubble Back 6285 Bubbleback WAFFLE Good Yellow gold 34mm Automatic
TOP
Rolex OYSTER PERPETUAL CHRONOMETER 18K GOLD HONEYCOMB WABENBLATT
S$ 6,408
Verified Dealer
561
DE
Omega Constellation 14393 Very good Gold/Steel 34mm Automatic
TOP
Omega Constellation Pie Pan Cal. 561 1962
S$ 3,533
Free shipping
Verified Dealer
100
DE
Breitling Avenger II GMT A3239011/C872 Good Steel 43mm Automatic
Breitling アベンジャー II GMT A3239011/C872
S$ 3,572
Free shipping
Verified Dealer
1150
JP
Bremont MB MBII-BK-OR Very good Steel 43mm Automatic
TOP
Bremont MBII Black Orange Barrel MBII-BK-OR
S$ 5,685
Free shipping
Verified Dealer
1036
US
Rolex Oyster Perpetual 34 114200 Very good Steel Automatic Singapore, Singapore
Rolex Oyster Perpetual 34 Black Full Set
S$ 5,500
Private Seller
SG
Hublot Classic Fusion Ultra-Thin 515.NX.1270.LR New Titanium 45mm Manual winding
TOP
Hublot Classic Fusion 45 ultra-thin
S$ 11,330
Verified Dealer
49
CH
Rolex Milgauss 116400GV New Steel 40mm Automatic
Rolex Milgauss Ref.116400GV Blue NEW 2020
S$ 14,374
Verified Dealer
310
NL
Panerai Special Editions PAM 00127 Very good Steel 47mm Manual winding Singapore, Singapore
Panerai Pam 127, b/p undated
S$ 18,250
Verified Dealer
14
SG
Omega Speedmaster Professional Moonwatch 311.30.44.50.01.001 Good Steel 44.25mm Automatic Singapore, Singapore
Omega Speedmaster Moonwatch Co-Axial Chronograph Enamel Dial
S$ 7,850
Verified Dealer
 
SG
Rolex Explorer 6610 Very good Steel 36mm Automatic
TOP
Rolex VINTAGE REF. 6610 EXPLORER GILT DIAL LOLLIPOP
S$ 20,862
Verified Dealer
561
DE
Breitling Chronoliner Y2431012-BE10 New Steel 45mm
Breitling CHRONOLINER 45MM Y2431012-BE10
S$ 5,765
Verified Dealer
90
US
TAG Heuer CAR5A90.FC6415 Very good Ceramic 45mm Automatic
TAG Heuer カレラ キャリバー ホイヤー02T トゥールビヨン CAR5A90.FC6415
S$ 11,643
Free shipping
Verified Dealer
1150
JP
Omega Speedmaster Broad Arrow 321.10.42.50.01.001 New Steel 42mm Automatic
Omega Speedmaster Broad Arrow Co-Axial Chronograph 42 mm...
S$ 5,127
Verified Dealer
840
JP
Tudor Pelagos 25600TN Unworn Titanium 42mm Automatic Singapore, Singapore
Tudor Pelagos
S$ 4,980
Private Seller
 
SG
Rolex Lady-Datejust 179138 New Yellow gold 26mm Automatic
TOP
Rolex Lady-Datejust 26
S$ 31,737
Verified Dealer
49
CH
Rolex Datejust 126334 Unworn Steel 41mm Automatic
Rolex UNWORN 2018 Datejust 41, White Baton, 126334, Jubilee...
S$ 15,172
Verified Dealer
UK
Breitling Chronomat GMT AB041012/BA69 Very good Steel 47mm Automatic Singapore, Singapore
Breitling Chronomat Gmt
S$ 5,699
Verified Dealer
 
SG
TAG Heuer Grand Carrera WAV5113.BA0901 Very good Steel 42.5mm Automatic Singapore, Singapore
TAG Heuer Grand Carrera Calibre 8 GMT 42.5mm
S$ 3,200
Verified Dealer
 
SG
Rolex Datejust 126300 Very good Steel 41mm Automatic
Rolex Datejust 41 Edelstahl 126300 Rhodium aus 2019 LC100
S$ 13,105
Verified Dealer
541
DE
Breitling A1338811-BD83 New Steel 44mm
Breitling COLT 44MM A1338811-BD83
S$ 4,191
Verified Dealer
90
US
Omega Seamaster 300 233.32.41.21.01.001 Good Steel 41mm Automatic
Omega シーマスター 300 マスター コーアクシャル スペクター・リミテッドエディション 233.32.41.21...
S$ 11,643
Free shipping
Verified Dealer
1150
JP
Rolex Explorer II 1655 Very good Steel 40mm Automatic
Rolex Explorer II Steve McQueen 1655
S$ 40,988
Free shipping
Verified Dealer
UK
F.P.Journe Elegante Unworn Titanium 48mm Quartz Singapore, Singapore
F.P.Journe F.P. Journe Elegante 48mm Titalyt
S$ 29,598
Private Seller
 
SG
Hublot Classic Fusion Ultra-Thin 545.OX.0180.LR New Rose gold 42mm Manual winding
TOP
Hublot Classic Fusion 42 ultra-thin
S$ 25,691
Verified Dealer
49
CH
Omega Constellation Men 123.20.38.21.02.002 New Steel 38mm Automatic
Omega Constellation Co-Axial 38 mm 123.20.38.21.02.002
S$ 9,298
Free shipping
Verified Dealer
452
TR
Sinn UX 403.030 Unworn Steel 44mm Quartz Singapore, Singapore
Sinn Diving Watch UX (EZM 2B) Hydro Oil Ref:403.030.EZM.2.UX...
S$ 3,230
Verified Dealer
 
SG
Breitling Chrono-Matic 49 M1436003/BA67 Good Steel 49mm Automatic Singapore, Singapore
Breitling Navitimer Chrono-Matic 49 Black-Steel
S$ 6,250
Verified Dealer
 
SG
Rolex Sea-Dweller 126600 Unworn Steel 43mm Automatic
Rolex Sea-Dweller 50th Anniversary 43mm NEW
S$ 20,488
Verified Dealer
674
LV
Rolex Oyster Perpetual Date 115200 Unworn Steel 34mm Automatic
Rolex Oyster Perpetual Date 34mm Edelstahl Ref. 115200
S$ 10,455
Verified Dealer
541
DE
Omega Seamaster 300 233.20.41.21.01.001 Good Steel 41mm Automatic
Omega シーマスター 300 マスター コーアクシャル 233.20.41.21.01.001
S$ 8,176
Free shipping
Verified Dealer
1150
JP
Omega Seamaster Planet Ocean 2201.50.00 Very good Steel 42mm Automatic Singapore, Singapore
Omega Seamaster Planet Ocean 600M FULL SET
S$ 4,300
Verified Dealer
301
SG
Omega Seamaster 300 233.30.41.21.01.001 Good 41mm Automatic Singapore, singapore
Omega Seamaster 300 233.30.41.21.01.001 Watch with Stainless...
S$ 4,888
Private Seller
 
SG
Breguet Classique 5140BA/12/9W6 New Yellow gold 40mm Automatic
TOP
Breguet Classique 40
S$ 16,621
Verified Dealer
49
CH
Omega Constellation 131.20.29.20.02.001 New Steel 29mm Automatic
Omega Constellation Co‑Axial Master Chronometer 29 mm 131.20.2...
S$ 9,079
Free shipping
Verified Dealer
452
TR
Omega Speedmaster 310.20.42.50.01.001 New Steel 42mm Manual winding
Omega Speedmaster Apollo 11 50th anniversary
Price on request
Verified Dealer
GR
Zenith El Primero 65.0520.4026 Very good White gold 44mm Automatic
TOP
Zenith Grande Class Grande Date Rattrapante, Split Second,...
S$ 20,438
Free shipping
Verified Dealer
37
CH
Tudor Black Bay 79230N-0001 Very good Steel 41mm Automatic Singapore, Singapore
Tudor Black Bay 41mm in Leather Ref: 79230N
S$ 3,465
Verified Dealer
58
SG
Rolex Oyster Perpetual Date 115200 Unworn Steel 34mm Automatic
Rolex Oyster Perpetual Date 34mm Edelstahl Ref. 115200
S$ 10,455
Verified Dealer
541
DE
Seiko King 5626-7041 Good Steel 36mm Automatic Singapore, SG
Seiko King Seiko COSC 5626 - 7041
S$ 1,100
Private Seller
 
SG
Rolex Sea-Dweller 126600 Unworn Steel 43mm Automatic
Rolex Sea-Dweller 126600, Strichindizes, 2020, Ungetragen,...
S$ 22,484
Verified Dealer
721
DE
Sinn 103 103.0619 New Steel 41mm Automatic
TOP
Sinn 103 St Sa RB Classic Watch Sondermodell
S$ 3,935
Verified Dealer
111
DE
Omega Seamaster Planet Ocean 232.32.46.21.01.005 Very good Steel 45.5mm Automatic Singapore, singapore
Omega Seamaster Planet Ocean 8500 Movement 45.5mm
S$ 4,482
Private Seller
 
SG
Panerai Luminor Marina PAM 00177 Very good Titanium 44mm Manual winding Singapore, Singapore
Panerai Luminor Marina
S$ 6,200
Private Seller
 
SG
Rolex Pearlmaster 81208 New Yellow gold 34mm Automatic
TOP
Rolex Datejust Pearlmaster 34
S$ 31,737
Verified Dealer
49
CH
Omega Constellation 131.10.39.20.01.001 New Steel 39mm Automatic
Omega Constellation Co‑Axial Master Chronometer 39 mm 131.10.3...
S$ 6,765
Free shipping
Verified Dealer
452
TR
Graham Chronofighter 2cfbps Very good Steel 43mm Automatic Singapore, Singapore
Graham Chronofighter "Stuffy" Limited Edition Ref: 2CFBPS
S$ 3,310
Verified Dealer
58
SG
Rolex Datejust 126334 New Steel 41mm Automatic
Rolex Datejust Rhodium Diamond Dial Automatic Men's Watch -...
S$ 18,654
Free shipping
Verified Dealer
2601
US
TAG Heuer Carrera Calibre 8 WAR5012.BA0723 Very good Steel 41mm Automatic Singapore, Singapore
TAG Heuer Carrera GMT Calibre 8
S$ 2,250
Verified Dealer
301
SG
Omega Seamaster PloProf 224.30.55.21.01.001 Unworn Steel 55mm Automatic Singapore, singapore
Omega Seamaster PloProf
S$ 9,800
Private Seller
 
SG
Ball Engineer Hydrocarbon Ball DM2118B-SCJ-BK New Steel 40mm Automatic Singapore, Singapore
Ball Engineer Hydrocarbon Original
S$ 2,850
Verified Dealer
191
SG
Omega Speedmaster Mark II 522.10.43.50.01.001 Very good Steel Automatic Singapore, singapore
Omega Speedmaster Mark II
S$ 6,200
Private Seller
 
SG
Zenith 01.0243.400 Very good Steel 39mm Automatic Singapore, Singapore
Zenith Chronomaster
S$ 5,662
Private Seller
 
SG
Rolex Lady-Datejust Pearlmaster 80319 New White gold 29mm Automatic
TOP
Rolex Lady-Datejust Pearlmaster 29
S$ 30,226
Verified Dealer
49
CH
Breitling Chronomat Colt A17388101C1A1 New Steel 44mm Automatic
Breitling Chronomat Colt Automatic 44 A17388101C1A1
S$ 3,477
Free shipping
Verified Dealer
452
TR
Rolex Datejust Turn-O-Graph 116263 Good Gold/Steel 36mm Automatic Singapore, Singapore
Rolex Japanese Turn-O-Graph Datejust 116263
S$ 18,200
Private Seller
 
SG
Tudor Black Bay Chrono 79350-0002 Very good Steel 41mm Automatic Singapore, Singapore
Tudor Black Bay Chronograph Ref: 79350
S$ 4,675
Verified Dealer
58
SG

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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