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Rolex Sea-Dweller
Rolex Sea-Dweller
S$ 17,663
Seller
Fully Lucky Limited
HK
Sinn 103 St Sa RB Classic Watch Sondermodell
Sinn 103 St Sa RB Classic Watch Sondermodell
S$ 3,743
Seller
Classic Watch
 
DE
Omega Speedmaster 125 Anniversary Ref ST 378.0801
Omega Speedmaster 125 Anniversary Ref ST 378.0801
S$ 4,980
Seller
GRluxury Pte Ltd
SG
Graham Chronofighter 43mm Roségold 2CFAR.B10A.C54B
Graham Chronofighter 43mm Roségold 2CFAR.B10A.C54B
S$ 14,238
Seller
KROMINI GOLD IMPEX S.R.L
 
RO
Rolex Daytona 116523 Stainless Steel & 18K Gold Model...
Rolex Daytona 116523 Stainless Steel & 18K Gold Model...
S$ 16,000
Seller
Private seller
SG
Rolex Sea-Dweller Deepsea
Rolex Sea-Dweller Deepsea
S$ 17,500
Seller
ARIELLE JEWELLERS AND WATCHES TRADING
SG
Zenith El-Primero Open Grand Class 03.0520.4021 44mm Black Dial
Zenith El-Primero Open Grand Class 03.0520.4021 44mm Black Dial
S$ 4,838
Free shipping
Seller
Watch-4-U
IL
Hublot King Power
Hublot King Power
S$ 18,000
Seller
Private seller
SG
Omega Constellation Ladies Red Gold and Steel
Omega Constellation Ladies Red Gold and Steel
S$ 9,950
Seller
Private seller
SG
Rolex Explorer II
Rolex Explorer II
S$ 5,300
Seller
s.t watch
SG
Rolex Sea-Dweller
Rolex Sea-Dweller
S$ 18,800
Free shipping
Seller
DUALL PTE LTD
SG
Panerai Luminor 1950 PAM 127 "Fiddy" Limited Edition
Panerai Luminor 1950 PAM 127 "Fiddy" Limited Edition
S$ 18,980
Seller
GRluxury Pte Ltd
SG
Rolex Explorer II "Orange Hand"
Rolex Explorer II "Orange Hand"
S$ 17,500
Seller
Monster Time Gallery
SG
TAG Heuer Grand Carrera
TAG Heuer Grand Carrera
S$ 4,068
Seller
Reclaimed Jewels
NL
Breitling Montbrillant Légende
Breitling Montbrillant Légende
S$ 5,207
Seller
Plinio Gioielli S.R.L.
 
IT
Tudor Chronautic Chronograph
Tudor Chronautic Chronograph
S$ 3,726
Seller
Georg Königbauer Uhren fürs Leben
 
DE
Breitling Bentley 24 Hour Chronograph Stainless Steel Black...
Breitling Bentley 24 Hour Chronograph Stainless Steel Black...
S$ 9,062
Seller
Feldmar Watch Company, Inc.
5
US
TAG Heuer Monza Chronograph 18K Gold Limited Edition Automatic
TAG Heuer Monza Chronograph 18K Gold Limited Edition Automatic
S$ 8,500
Seller
Lu-Ann Vintage Collection
SG
Rolex Datejust Rare Ivory Roman Dial Year 1979 Full Complete Set
Rolex Datejust Rare Ivory Roman Dial Year 1979 Full Complete Set
S$ 6,014
Seller
Asia Timepiece
SG
Omega Seamaster Diver - Men's watch - 2000's
Omega Seamaster Diver - Men's watch - 2000's
S$ 2,441
Estimated price
Seller
Catawiki BV
 
Omega Ploprof 1200M
Omega Ploprof 1200M
S$ 7,280
Seller
GRluxury Pte Ltd
SG
Panerai Luminor Power Reserve PAM27
Panerai Luminor Power Reserve PAM27
S$ 9,850
Seller
Monster Time Gallery
SG
Rolex Daytona (White dial)
Rolex Daytona (White dial)
S$ 20,848
Seller
Private seller
 
UK
Hublot 301.AI.460.RX
Hublot 301.AI.460.RX
S$ 14,042
Seller
Deluxe ( Asia ) Ltd
 
HK
Tudor Chronograph
Tudor Chronograph
S$ 3,824
Seller
Georg Königbauer Uhren fürs Leben
 
DE
Omega Seamaster Aqua Terra Chronograph Gmt Stainless Steel...
Omega Seamaster Aqua Terra Chronograph Gmt Stainless Steel...
S$ 8,087
Seller
Feldmar Watch Company, Inc.
5
US
Rolex Oyster Perpetual Datejust Stainless Steel White Gold Watch
Rolex Oyster Perpetual Datejust Stainless Steel White Gold Watch
S$ 4,624
Seller
La Jolla Jewelry and Collateral Loan Company
7
US
Rolex Datejust Ref 69173 Lady 18K Gold Steel
Rolex Datejust Ref 69173 Lady 18K Gold Steel
S$ 4,078
Seller
Asia Timepiece
SG
Omega Seamaster Diver 300 M Chronograph – 2004
Omega Seamaster Diver 300 M Chronograph – 2004
S$ 3,987
Estimated price
Seller
Catawiki BV
 
Omega Seamaster Professional 300m Automatic - 41 mm
Omega Seamaster Professional 300m Automatic - 41 mm
S$ 2,750
Seller
wagener-gold International e.K.
603
DE
Breitling Navitimer Heritage
Breitling Navitimer Heritage
S$ 4,670
Seller
Private seller
 
RO
Rolex Vintage Explorer II "Albino" Straight hand
Rolex Vintage Explorer II "Albino" Straight hand
S$ 22,800
Seller
Monster Time Gallery
SG
Breitling Chronomat 41 Rosegold/Steel Full Set Unworn
Breitling Chronomat 41 Rosegold/Steel Full Set Unworn
S$ 9,682
Seller
Private seller
 
BE
IWC Portuguese Chronograph
IWC Portuguese Chronograph
S$ 7,321
Seller
Private seller
 
PT
Rolex Sea-Dweller
Rolex Sea-Dweller
S$ 25,222
Seller
Private seller
 
SI
Rolex Sea-Dweller Deepsea
Rolex Sea-Dweller Deepsea
S$ 19,511
Seller
Private seller
 
DE
Montblanc 1858 Monopusher Chronograph Limited Edition
Montblanc 1858 Monopusher Chronograph Limited Edition
S$ 21,980
Seller
Private seller
 
CH
Baume & Mercier Classima XL Chronograph Executives
Baume & Mercier Classima XL Chronograph Executives
S$ 2,099
Seller
Private seller
 
DE
Omega Seamaster Planet Ocean Titan
Omega Seamaster Planet Ocean Titan
S$ 6,265
Seller
Private seller
 
AT
Omega Seamaster Diver 300 M
Omega Seamaster Diver 300 M
S$ 4,556
Seller
Private seller
 
DE
Omega Seamaster 300m chronometer Chronograph America's Cup...
Omega Seamaster 300m chronometer Chronograph America's Cup...
S$ 6,509
Estimated price
Seller
Catawiki BV
 
Audemars Piguet Royal Oak Rubens Barrichello II Limited...
Audemars Piguet Royal Oak Rubens Barrichello II Limited...
S$ 96,255
Seller
Private seller
 
UK
Rolex Datejust
Rolex Datejust
S$ 3,456
Seller
Asia Timepiece
SG
Omega Seamaster Aqua Terra
Omega Seamaster Aqua Terra
S$ 11,389
Seller
Private seller
 
DE
Rolex Daytona
Rolex Daytona
S$ 37,427
Seller
Private seller
 
IT
Junghans Meister Chronoscope
Junghans Meister Chronoscope
S$ 2,034
Seller
Private seller
 
FR
Breitling Superocean Steelfish Stainless Steel Silver Dial...
Breitling Superocean Steelfish Stainless Steel Silver Dial...
S$ 5,184
Seller
Feldmar Watch Company, Inc.
5
US
Breitling Chronomat 44 Airborne
Breitling Chronomat 44 Airborne
S$ 6,021
Seller
Private seller
 
DE
Doxa Anti-Magnetic Chronograph
Doxa Anti-Magnetic Chronograph
S$ 228
Seller
Private seller
 
HU
Baume & Mercier Capeland Ref. 65716
Baume & Mercier Capeland Ref. 65716
S$ 3,173
Seller
Private seller
 
DE
Jaeger-LeCoultre GEOMATIC men's watch, 1960s
Jaeger-LeCoultre GEOMATIC men's watch, 1960s
S$ 10,089
Estimated price
Seller
Catawiki BV
 
Rolex Vintage Oyster Perpetual Datejust Ref 1601 (Year 1970)
Rolex Vintage Oyster Perpetual Datejust Ref 1601 (Year 1970)
S$ 3,663
Seller
Asia Timepiece
SG
IWC Ingenieur Chronograph Edition "74th Members Meeting at...
IWC Ingenieur Chronograph Edition "74th Members Meeting at...
S$ 25,195
Seller
Private seller
 
UK
Montblanc Timewalker Twinfly Greytech Titanium Chrono
Montblanc Timewalker Twinfly Greytech Titanium Chrono
S$ 8,295
Seller
Private seller
 
US
A. Lange & Söhne Savonette  ALS  1B,  14 Kt,  Top=Wie Neu,...
A. Lange & Söhne Savonette ALS 1B, 14 Kt, Top=Wie Neu,...
S$ 7,974
Seller
Private seller
 
DE
Rolex Oyster Perpetual Datejust Stainless Steel Blue Face Watch
Rolex Oyster Perpetual Datejust Stainless Steel Blue Face Watch
S$ 4,002
Seller
La Jolla Jewelry and Collateral Loan Company
7
US
TAG Heuer Classic Monza Chronograph CR2114 FC6164
TAG Heuer Classic Monza Chronograph CR2114 FC6164
S$ 3,743
Seller
Private seller
 
PT
Rolex Rare S/S O/P UAE Air Force Pepsi Bezel GMT-Master...
Rolex Rare S/S O/P UAE Air Force Pepsi Bezel GMT-Master...
S$ 168,557
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
54
UK
Clerc Hydroscaph  Chronometer H1 -1.B.3
Clerc Hydroscaph Chronometer H1 -1.B.3
S$ 8,600
Seller
Private seller
 
DE
Zenith EPERVIER CRONO EL PRIMERO 400 MM.38 31JW DATE ACC.-ORO...
Zenith EPERVIER CRONO EL PRIMERO 400 MM.38 31JW DATE ACC.-ORO...
S$ 4,149
Seller
Private seller
 
IT
Paul Picot Plongeur C-Type 43 mm, men's watch, Limited...
Paul Picot Plongeur C-Type 43 mm, men's watch, Limited...
S$ 4,475
Estimated price
Seller
Catawiki BV
 

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.