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Breitling Transocean Chronograph Unitime AB0510U0/A732/152A Very good Steel 46mm Automatic
TOP
Breitling Transocean Chronograph Unitime
S$ 9,164
Verified Dealer
84
CZ
Urwerk UR-210 UR-210BPT Royal Hawk Very good Platinum 53.6mm Automatic
TOP
Urwerk UR-210 BPT Royal Hawk.
S$ 183,079
Verified Dealer
13
US
Rolex Datejust 126334 Very good Steel 41mm Automatic
TOP
Rolex Datejust 126334 41mm Brilli silver
S$ 14,952
Verified Dealer
194
IT
Ulysse Nardin Marine Chronometer Manufacture 1183-126-3/43 Very good Steel 43mm Automatic
TOP
Ulysse Nardin Marine Chronometer Manufacture
S$ 7,235
Verified Dealer
84
CZ
Rolex Datejust 16238 Very good Yellow gold 36mm Automatic
TOP
Rolex Datejust Lapis Lazuli 16238
S$ 34,934
Free shipping
Verified Dealer
504
UK
Rolex Lady-Datejust 179384 New Steel 26mm Automatic
TOP
Rolex Lady-Datejust 26, mother-of-pearl dial/10 blue sapphires
S$ 17,443
Verified Dealer
45
CH
Rolex Day-Date 18346 Good Platinum 36mm Automatic Singapore, Singapore
Rolex Day-Date 18346
S$ 35,883
Free shipping
Verified Dealer
 
SG
Rolex Lady-Datejust 178273 Very good Gold/Steel 31mm Automatic
TOP
Rolex Datejust Oyster Perpetual 31 mm Steel Yellow Gold Diamond
S$ 13,344
Free shipping
Verified Dealer
204
RO
Carl F. Bucherer Manero 10901.03.16.01 Very good 40mm Automatic Singapore, singapore
TOP
Carl F. Bucherer Manero Retrograde
S$ 8,888
Private Seller
 
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$ 7,750
Verified Dealer
 
SG
Ulysse Nardin Perpetual Manufacture 329-10 New Platinum 43mm Automatic
TOP
Ulysse Nardin Perpetual Manufacture 43mm - Limited Edition
S$ 43,910
Free shipping
Verified Dealer
498
US
Omega Speedmaster Professional Moonwatch Moonphase 304.93.44.52.03.002 Unworn Ceramic 44.25mm Automatic Singapore, Singapore
Omega Speedmaster Professional Moonwatch Moonphase
S$ 13,588
Verified Dealer
 
SG
Montblanc Heritage Chronométrie 112534 New Steel 40mm Automatic
TOP
Montblanc Heritage Chronométrie Quantième Annuel 112534
S$ 3,617
Verified Dealer
1006
BE
Breitling Chronomat 44 AB011010/BB08 Very good Steel 44mm Automatic Singapore, Singapore
Breitling Chronomat 44mm 2017 Flying Fish Complete 5 Yrs Warranty
S$ 5,850
Verified Dealer
13
SG
Breguet GJ24BB8548DDC3 New White gold Automatic
TOP
Breguet Secret de la Reine
S$ 75,896
Verified Dealer
45
CH
Rado 56-H Very good Yellow gold 35mm Automatic
TOP
Rado Chronometre 56-H Mark I
S$ 10,256
Verified Dealer
26
CH
Omega Seamaster 300 233.30.41.21.01.001 Very good Steel 41mm Automatic Singapore, Singapore
Omega Seamaster 300 Master Co-Axial 41mm Ref: 233.30.41.21.01.001
S$ 4,780
Verified Dealer
32
SG
Breitling Navitimer 01 RB012012|BA49|435X|R20BA.1 New Red gold 44mm Automatic
TOP
Breitling NAVITIMER 01 ROSEGOLD RB012012 unworn 12230HT
S$ 22,347
Free shipping
Verified Dealer
149
FR
TAG Heuer Grand Carrera WAV5113.BA0901 Very good Steel 42.5mm Automatic Singapore, Singapore
TAG Heuer Grand Carrera Calibre 8 GMT 42.5mm
S$ 3,050
Verified Dealer
 
SG
F.P.Journe Elegante Unworn Titanium 48mm Quartz Singapore, Singapore
F.P.Journe F.P. Journe Elegante 48mm Titalyt
S$ 26,656
Private Seller
 
SG
Omega Seamaster 300 233.32.41.21.01.001 Very good Steel 41mm Automatic Singapore, Singapore
Omega Seamaster 300
S$ 11,800
Verified Dealer
 
SG
Patek Philippe Chronograph Good Manual winding
TOP
Patek Philippe Very rare antique 1875 Split Chronograf
S$ 16,061
Verified Dealer
110
PL
Ball Engineer Hydrocarbon DG2018C-S3C-BK New Steel 42mm Automatic Singapore, Singapore
Ball Engineer Hydrocarbon AeroGMT II Red/Black DG2018C-S3C-BK
S$ 3,280
Verified Dealer
83
SG
Jaquet-Droz Grande Seconde J014013208 New Rose gold 39mm Automatic
TOP
Jaquet-Droz Grande Seconde 39, limited edition - no. 1/8
S$ 22,716
Verified Dealer
45
CH
Ulysse Nardin Marine 263-22 Very good Steel 36mm Automatic
TOP
Ulysse Nardin Marine Chronometer 263-22 Watch with Stainless...
S$ 4,760
Free shipping
Verified Dealer
593
US
Omega Seamaster Aqua Terra 231.10.42.21.03.003 Very good Steel 41.5mm Automatic Singapore, Singapore
Omega Seamaster Aqua Terra James Bond Ref: 231.10.42.21.03.003
S$ 4,885
Verified Dealer
32
SG
Hublot Big Bang 44 mm 301.QX.1791.HR New Carbon 44mm Automatic
TOP
Hublot Big Bang Carbon Bezel Baguette 23650€ HT
S$ 43,248
Free shipping
Verified Dealer
149
FR
Breitling Chrono-Matic 49 M1436003/BA67 Good Steel 49mm Automatic Singapore, Singapore
Breitling Navitimer Chrono-Matic 49 Black-Steel
S$ 5,950
Verified Dealer
 
SG
Omega Constellation Day-Date 168.029 Good Steel 35mm Automatic Singapore, Singapore
Omega Constellation Day-Date
S$ 788
Private Seller
 
SG
Sinn 103 103.031 New Steel 41mm Automatic
TOP
Sinn 103 ST
S$ 2,974
Verified Dealer
91
DE
TAG Heuer Carrera Calibre 17 CV5110.FC6310 Very good Steel 41mm Automatic
TOP
TAG Heuer Carrera Calibre 17 / Full set
S$ 4,984
Verified Dealer
110
PL
Tissot Touch T075.220.11.106.00 New Steel 39,5mm Quartz
TOP
Tissot Touch Solar Mother Diamond
S$ 1,220
Verified Dealer
160
ES
Breguet Reine de Naples 8967ST/V8/J50 New Steel 43mm Automatic
TOP
Breguet Reine de Naples
S$ 19,373
Verified Dealer
45
CH
Ulysse Nardin Marine 263-22 Good Steel 36mm Automatic
TOP
Ulysse Nardin Maxi Marine Chronometer 1846 263-22 Watch with...
S$ 4,760
Free shipping
Verified Dealer
593
US
Ball Ball DM2118B-SCJ-BK New Steel 40mm Automatic Singapore, Singapore
Ball DM2118B-SCJ-BK
S$ 2,850
Verified Dealer
83
SG
Breitling Chronomat 44 AB011012|B967|435X|A20BA.1 Unworn Steel 44mm Automatic
TOP
Breitling CHRONOMAT 44 AUTOMATIC AB011012
S$ 8,344
Free shipping
Verified Dealer
149
FR
Omega Constellation Ladies 123.25.27.20.55.005 Very good Gold/Steel 27mm Automatic Singapore, Singapore
Omega Constellation Ladies Two-Tone Co-Axial
S$ 7,450
Verified Dealer
 
SG
Tudor 79363N Very good Gold/Steel Automatic Singapore, Singapore
Tudor Black Bay Chrono [LNIB] [CHEAPEST WORLDWIDE] Steel &...
S$ 6,050
Private Seller
 
SG
Omega Speedmaster Professional Moonwatch Moonphase 304.30.44.52.01.001 Very good Steel Automatic Singapore, Singapore
Omega Speedmaster Professional Moonphase Ref: 304.30.44.52.01.001
S$ 9,400
Verified Dealer
32
SG
Sinn 103 103.0619 New Steel 41mm Automatic
TOP
Sinn 103 St Sa RB Classic Watch Sondermodell
S$ 3,939
Verified Dealer
91
DE
Omega Seamaster Diver 300 M 212.30.42.50.01.001 New Steel 41.5mm Automatic
TOP
Omega Seamaster Diver 300 M Co‑Axial Chronograph 41.5 mm...
S$ 5,456
Verified Dealer
693
JP
Hublot Classic Fusion Ultra-Thin 545.OX.2210.LR New Rose gold 45mm Manual winding
TOP
Hublot Classic Fusion 42 ultra-thin
S$ 25,040
Verified Dealer
45
CH
Ulysse Nardin Marine Chronometer Manufacture 1185-126-3T/45 Very good Steel 43mm Automatic
TOP
Ulysse Nardin Marine Chronometer 1185-126-3T/45 Watch with...
S$ 9,081
Free shipping
Verified Dealer
593
US
Rolex Daytona 116523 Very good Gold/Steel Automatic Singapore, Hong kong
Rolex Daytona 116523
S$ 16,800
Private Seller
 
SG
Breitling Colt Quartz A7438811/BD45-173A New Steel 44mm Quartz Singapore, Singapore
Breitling Colt Quartz
S$ 3,300
Verified Dealer
83
SG
Rolex Day-Date 118366 Unworn Platinum 36mm Automatic
TOP
Rolex DAY-DATE Platinum | 118366 | Baguette Bezel | Full Set |
S$ 93,248
Verified Dealer
29
DE
Tudor Black Bay Chrono 79350 Very good Steel 41mm Automatic Singapore, Singapore
Tudor Heritage Black Bay Chronograph
S$ 4,450
Verified Dealer
216
SG
Oris Big Crown 01 674 7567 4064-07 8 21 61 Fair Steel 42mm Automatic Singapore, Singapore
Oris BIG CROWN CHRONOGRAPH
S$ 1,800
Private Seller
 
SG
Graham Chronofighter 2cfbps Very good Steel 43mm Automatic Singapore, Singapore
Graham Chronofighter "Stuffy" Limited Edition Ref: 2CFBPS
S$ 3,310
Verified Dealer
32
SG
Breitling Navitimer AB01219X/M535 Very good 43mm Automatic Singapore, Singapore
Breitling Navitimer AB0121 - Japan Limited Edition (No. 58 /...
S$ 8,000
Private Seller
 
SG
Montblanc Star 7038 Very good Steel 36mm Quartz Singapore, singapore
Montblanc Star Chronograph
S$ 1,157
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$ 13,667
Verified Dealer
45
CH
Ulysse Nardin Marine Chronometer Manufacture 1183-126 Very good Steel 43mm Automatic
TOP
Ulysse Nardin Marine Chronometer 1183-126 Watch with Leather...
S$ 8,055
Free shipping
Verified Dealer
593
US
Rolex Datejust Rolex Datejust 178275F New Rose gold 31mm Automatic Singapore, Singapore
Rolex Datejust 31mm 178275F
S$ 43,000
Verified Dealer
83
SG
Omega De Ville Prestige 424.53.40.21.02.002 Very good Yellow gold 39.5mm Automatic
TOP
Omega De Ville Prestige Co-Axial Power Reserve Yellow Gold
S$ 9,566
Free shipping
Verified Dealer
622
NL
Ball Engineer Master II CM3189D-SCJ-BK Unworn Steel 44mm Automatic Singapore, singapore
Ball Engineer Master II Normandy
S$ 3,200
Private Seller
 
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
Tudor Black Bay 79230R-0003 New Steel 41mm Automatic Singapore, Singapore
Tudor Black Bay 58 'State of Qatar'
S$ 12,810
Verified Dealer
32
SG
G 7008 RG-BK New Steel 44mm Quartz Singapore, Singapore
Aries Gold Chronograph Jolter Rose Gold G 7008 Rg-bk
S$ 168
Verified Dealer
55
SG
Omega Seamaster Planet Ocean 232.32.44.22.01.001 Very good Steel 43,5mm Automatic Singapore, Singapore
Omega Seamaster Planet Ocean GMT Co Axial 600M
S$ 5,100
Verified Dealer
216
SG
Rolex Datejust 116188 New Yellow gold 36mm Automatic
TOP
Rolex Datejust 36
S$ 28,839
Verified Dealer
45
CH
Ulysse Nardin Marine 1183-170-3/92 Very good Titanium 44mm Automatic
TOP
Ulysse Nardin Diver Chronometer 1183-170-3/92 Watch with...
S$ 7,689
Free shipping
Verified Dealer
593
US
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
Rolex Datejust II 116334 Very good Steel 41mm Automatic Singapore, Singapore
Rolex Datejust II
S$ 10,800
Private Seller
 
SG
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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.