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Omega Seamaster 300 "Spectre"
TOP
Omega Seamaster 300 "Spectre"
8,200 
Seller
KronologY
47
FR
Rolex Daytona 116523
TOP
Rolex Daytona 116523
12,030 
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
221
UK
Rolex Oyster Perpetual Date "Blue"  18K Gold Service 03/2018
TOP
Rolex Oyster Perpetual Date "Blue" 18K Gold Service 03/2018
4,790 
Seller
Timeless Watches GmbH
230
DE
Ulysse Nardin Maxi Marine Diver Titanium and Gold
Ulysse Nardin Maxi Marine Diver Titanium and Gold
5,990 
Seller
Kellokonttori
13
FI
Omega Seamaster Diver 41mm Co-Axial Automatic Date
TOP
Omega Seamaster Diver 41mm Co-Axial Automatic Date
2,620 
Seller
Montredo GmbH
735
DE
Chopard Grand Prix de Monaco Historique Power Control NEW
TOP
Chopard Grand Prix de Monaco Historique Power Control NEW
5,225 
Seller
Juwelier Burger, since 2001
726
NL
Breitling Navitimer Chronograph Automatic Rare White -...
TOP
Breitling Navitimer Chronograph Automatic Rare White -...
3,150 
Free shipping
Seller
Pawndeluxe
169
NL
Breitling Navitimer World 46mm 2010 Breitling Service 2016
Breitling Navitimer World 46mm 2010 Breitling Service 2016
3,890 
Seller
Chrono Finland
52
FI
Paul Picot Plongeur C-Type - Protector Case
TOP
Paul Picot Plongeur C-Type - Protector Case
2,650 
Seller
Gold & Co SRL
8
IT
Breitling Superocean 42
Breitling Superocean 42
1,750 
Seller
Private Seller
 
FI
Zenith El Primero Grande Class White Gold Limited Edition Ref....
TOP
Zenith El Primero Grande Class White Gold Limited Edition Ref....
4,900 
Seller
Orologeria Duomo Milano
82
IT
Omega Constellation C Date
Omega Constellation C Date
950 
Seller
Harri Asunta
9
FI
Rolex Sea-Dweller 126600 / 43mm
TOP
Rolex Sea-Dweller 126600 / 43mm
11,999 
Free shipping
Seller
exclusive-chrono.com
193
NL
Omega Seamaster Planet Ocean Co-Axial Master Chronometer 44mm...
TOP
Omega Seamaster Planet Ocean Co-Axial Master Chronometer 44mm...
4,115 
Seller
Montredo GmbH
735
DE
Rolex GMT-Master II 116759SARU june 2020 Rolex warranty
TOP
Rolex GMT-Master II 116759SARU june 2020 Rolex warranty
62,000 
Seller
MMC RIVIERA
6
MC
Hermès Clipper CP1.910 Chronograph Best Men's Model
TOP
Hermès Clipper CP1.910 Chronograph Best Men's Model
2,650 
Free shipping
Seller
Pawndeluxe
169
NL
Rolex DATEJUST 1603 WHITE 1977
TOP
Rolex DATEJUST 1603 WHITE 1977
3,000 
Seller
Goldammer
18
DE
Rolex Explorer I SEL scat/gar art. Re775
TOP
Rolex Explorer I SEL scat/gar art. Re775
4,100 
Seller
Stroppiana SRL
304
IT
Omega Seamaster Planet Ocean Chronograph
Omega Seamaster Planet Ocean Chronograph
3,450 
Seller
Private Seller
 
FI
Rolex Submariner Sultan
Rolex Submariner Sultan
8,600 
Seller
Gellot Oy Ltd
 
FI
Sinn 103 St Sa RB Classic Watch Sondermodell
TOP
Sinn 103 St Sa RB Classic Watch Sondermodell
2,450 
Seller
Classic Watch
21
DE
Rolex Datejust 126334  ( New )
TOP
Rolex Datejust 126334 ( New )
7,499 
Free shipping
Seller
exclusive-chrono.com
193
NL
Omega Speedmaster Moonwatch Professional 44mm Co-Axial Moonphase
TOP
Omega Speedmaster Moonwatch Professional 44mm Co-Axial Moonphase
6,640 
Seller
Montredo GmbH
735
DE
Breitling Superocean Héritage Chronograph
Breitling Superocean Héritage Chronograph
3,900 
Seller
Private Seller
 
FI
Gérald Genta Sport Retro Steel & Rubber Full Set Box + Papers
TOP
Gérald Genta Sport Retro Steel & Rubber Full Set Box + Papers
2,175 
Free shipping
Seller
Pawndeluxe
169
NL
Rolex Daytona 116520 N.O.S New Old Stock Série Z
TOP
Rolex Daytona 116520 N.O.S New Old Stock Série Z
18,900 
Seller
MMC RIVIERA
6
MC
Omega Constellation Day-Date
Omega Constellation Day-Date
6,936 
Seller
Private Seller
 
FI
Rolex Yacht-Master II
TOP
Rolex Yacht-Master II
25,000 
Seller
Reclaimed Jewels
11
NL
Chanel J12 chrono automatic art. Nr135
TOP
Chanel J12 chrono automatic art. Nr135
5,950 
Seller
Stroppiana SRL
304
IT
Omega Seamaster Railmaster Master Chronometer 220.12.40.20.01.001
TOP
Omega Seamaster Railmaster Master Chronometer 220.12.40.20.01.001
3,300 
Seller
Uhren2000 GmbH
357
DE
Breitling Chronospace Evo B60 | 43MM
TOP
Breitling Chronospace Evo B60 | 43MM
3,785 
Seller
Juwelier van Willegen
41
NL
Chopard Mille Miglia 42mm Automatic Chronograph
TOP
Chopard Mille Miglia 42mm Automatic Chronograph
3,050 
Seller
Montredo GmbH
735
DE
Omega Seamaster Diver 300 M
TOP
Omega Seamaster Diver 300 M
2,005 
Seller
Chase Hattan
25
UK
Breitling Supersports Bentley B55 Carbon | Limited ED 500pcs-...
TOP
Breitling Supersports Bentley B55 Carbon | Limited ED 500pcs-...
4,250 
Free shipping
Seller
Pawndeluxe
169
NL
Rolex “Four-Line” “Zenith” Daytona Ref. 16520 in Steel
Auction
Rolex “Four-Line” “Zenith” Daytona Ref. 16520 in Steel
15,524 
Estimated price
Seller
Fortuna
 
Breitling Chronoliner B04 Rose Gold(Limited Edition)
TOP
Breitling Chronoliner B04 Rose Gold(Limited Edition)
20,200 
Free shipping
Seller
Istock LTD
108
LV
Rolex Datejust
TOP
Rolex Datejust
2,750 
Seller
Reclaimed Jewels
11
NL
Breitling for Bentley Motors Chronograph A25362 Special...
TOP
Breitling for Bentley Motors Chronograph A25362 Special...
4,348 
Seller
CHRONO WATCH
94
UK
Hublot King Power F1 India,  Ltd Edition, Box & Papers
TOP
Hublot King Power F1 India, Ltd Edition, Box & Papers
18,905 
Seller
Tempvs Ltd
110
UK
Rolex GMT-Master Vintage UAE Air Force 1675
Rolex GMT-Master Vintage UAE Air Force 1675
108,844 
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
221
UK
Omega De Ville Ladymatic 34mm Co-Axial Automatic Date
TOP
Omega De Ville Ladymatic 34mm Co-Axial Automatic Date
4,965 
Seller
Montredo GmbH
735
DE
Omega Seamaster Automatic Chrono
Omega Seamaster Automatic Chrono
2,450 
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
253
DE
Rolex Datejust II Diamond Sundust Dial Jubilee Rose Gold
Rolex Datejust II Diamond Sundust Dial Jubilee Rose Gold
10,865 
Seller
Ahead Of Time Sunny Isles LLC
9
US
Rolex Oyster Perpetual Ref. 1002 in Steel
Auction
Rolex Oyster Perpetual Ref. 1002 in Steel
1,294 
Estimated price
Seller
Fortuna
 
Omega Speedmaster Professional Moonwatch Ref 311.33.44.51.01.001
Omega Speedmaster Professional Moonwatch Ref 311.33.44.51.01.001
5,473 
Seller
Horlogerie Desbiolles
 
CH
Rolex Daytona 116519 White Gold
Rolex Daytona 116519 White Gold
16,200 
Seller
Premium Watches
11
FI
Omega Seamaster Aqua Terra Chronograph 231.20.44.50.06.001
TOP
Omega Seamaster Aqua Terra Chronograph 231.20.44.50.06.001
5,213 
Seller
CHRONO WATCH
94
UK
Omega Seamaster Diver 300 M Co Axial
TOP
Omega Seamaster Diver 300 M Co Axial
2,692 
Free shipping
Seller
JPA Watch Company Ltd
51
UK
Rolex Explorer II Steve McQueen 1655
Rolex Explorer II Steve McQueen 1655
22,857 
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
221
UK
Breitling Cockpit 46mm Black Titanium Quartz
TOP
Breitling Cockpit 46mm Black Titanium Quartz
4,940 
Seller
Montredo GmbH
735
DE
Rolex Daytona
Rolex Daytona
12,200 
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
253
DE
Rolex Datejust 16233 36 mm Gold Stahl silber Zifferblatt
Rolex Datejust 16233 36 mm Gold Stahl silber Zifferblatt
4,750 
Seller
KLASSISCHE UHREN KRETZSCHMAR
23
DE
Rolex Explorer II Ref. 16550 in Steel
Auction
Rolex Explorer II Ref. 16550 in Steel
5,175 
Estimated price
Seller
Fortuna
 
Ulysse Nardin El Toro / Black Toro, Perpetual Calendar, GMT,...
Ulysse Nardin El Toro / Black Toro, Perpetual Calendar, GMT,...
20,637 
Seller
Horlogerie Desbiolles
 
CH
Chopard Mille Miglia 8920 Brescia-Roma-Brescia
Chopard Mille Miglia 8920 Brescia-Roma-Brescia
2,090 
Seller
Krono Time
 
RO
Rolex Datejust 41mm  Navy Blue  Index Jubilee 126334
Rolex Datejust 41mm Navy Blue Index Jubilee 126334
7,921 
Seller
Harley's Time LLC
158
US
IWC Portuguese Chronograph 41mm IW371445 Ex IW371401
IWC Portuguese Chronograph 41mm IW371445 Ex IW371401
5,690 
Free shipping
Seller
SORELLE RONCO
692
IT
Rolex Milgauss Rare Vintage 1019
Rolex Milgauss Rare Vintage 1019
21,196 
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
221
UK
Chopard Mille Miglia 44mm Automatic Chronometer
TOP
Chopard Mille Miglia 44mm Automatic Chronometer
4,689 
Seller
Montredo GmbH
735
DE
Rolex Submariner
Rolex Submariner
17,850 
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
253
DE
Rolex Datejust 116200 Oysterband schwarz Index LC100
Rolex Datejust 116200 Oysterband schwarz Index LC100
5,250 
Seller
KLASSISCHE UHREN KRETZSCHMAR
23
DE
Rolex 116660 Sea Dweller Deep Sea (29188)
Rolex 116660 Sea Dweller Deep Sea (29188)
8,840 
Seller
European Watch Company
159
US
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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.

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