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Rolex Big Red Daytona 6263
TOP
Rolex Big Red Daytona 6263
C$ 144,101
Free shipping
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Watches & Jewellery of Bond Street Ltd
144
UK
Omega RACING  CO-AXIAL MASTER CHRONOMETER CHRONOGRAPH 44.25 M
TOP
Omega RACING CO-AXIAL MASTER CHRONOMETER CHRONOGRAPH 44.25 M
C$ 7,825
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Prestige Watch
103
US
Rolex Submariner Tropical 1680
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Rolex Submariner Tropical 1680
C$ 53,170
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Watches & Jewellery of Bond Street Ltd
144
UK
Rolex Daytona Grossular 116589SALV
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Rolex Daytona Grossular 116589SALV
C$ 157,709
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Watches & Jewellery of Bond Street Ltd
144
UK
Rolex Daytona Diamond & Ruby Set 116589SALV
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Rolex Daytona Diamond & Ruby Set 116589SALV
C$ 152,302
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Watches & Jewellery of Bond Street Ltd
144
UK
Omega Men's Omega Seamaster Professional 300M 2561.80 Blue...
Omega Men's Omega Seamaster Professional 300M 2561.80 Blue...
C$ 1,915
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Collectors Coins & Jewelry
 
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Breitling Avenger II Seawolf Yellow Black M17331E2/I530 LIMITED
Breitling Avenger II Seawolf Yellow Black M17331E2/I530 LIMITED
C$ 3,847
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Alux Watches
 
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Omega Grey Side of the Moon Speedmaster UNWORN
Omega Grey Side of the Moon Speedmaster UNWORN
C$ 12,163
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LBA Exquisite Time Pieces
5
US
Breitling Navitimer World (A24322)
Breitling Navitimer World (A24322)
C$ 5,130
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The Watch Movement
 
US
Omega Speedmaster Mark II Co-Axial Chronograph
Omega Speedmaster Mark II Co-Axial Chronograph
C$ 4,840
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Horology 411
 
US
Omega Seamaster Aqua Terra 150M 231.13.42.21.03.001 Watch with...
Omega Seamaster Aqua Terra 150M 231.13.42.21.03.001 Watch with...
C$ 4,233
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Crown & Caliber
10
US
Breitling Super Avenger II
Breitling Super Avenger II
C$ 5,965
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Lana's Jewelry
8
US
Rolex Day-Date
Rolex Day-Date
C$ 14,500
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IT'S ABOUT TIME & JEWELRY
CA
Rolex Explorer II Steve McQueen 1655
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Rolex Explorer II Steve McQueen 1655
C$ 35,958
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Watches & Jewellery of Bond Street Ltd
144
UK
Rolex 2017 Rolex Air-King 40mm Green Yellow Black Arabic...
Rolex 2017 Rolex Air-King 40mm Green Yellow Black Arabic...
C$ 7,433
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Omega Seamaster Ploprof White 1200m White  Rubber
Omega Seamaster Ploprof White 1200m White Rubber
C$ 6,413
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Alux Watches
 
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Omega Constellation C-Shape
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Omega Constellation C-Shape
C$ 1,331
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Vintage Watch Services
203
NL
Breitling Chrono-Matic 1461 (A19360)
Breitling Chrono-Matic 1461 (A19360)
C$ 5,130
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The Watch Movement
 
US
Rolex Date - Under Factory Warranty & Original Papers
Rolex Date - Under Factory Warranty & Original Papers
C$ 7,633
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Horology 411
 
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Omega Seamaster 300 233.30.41.21.01.001 Watch with Stainless...
Omega Seamaster 300 233.30.41.21.01.001 Watch with Stainless...
C$ 4,907
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Crown & Caliber
10
US
Breitling Super Avenger II
Breitling Super Avenger II
C$ 5,965
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Lana's Jewelry
8
US
Omega Constellation
Omega Constellation
C$ 3,000
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IT'S ABOUT TIME & JEWELRY
CA
Montblanc Star
Montblanc Star
C$ 2,100
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Private Seller
CA
Rolex Submariner Date 116618 Ceramic 18K Yellow Gold Blue 40mm...
Rolex Submariner Date 116618 Ceramic 18K Yellow Gold Blue 40mm...
C$ 31,549
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Collectors Coins & Jewelry
 
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Breitling Avenger II GMT Black PVD Steel 43mm M3239010/BF04...
Breitling Avenger II GMT Black PVD Steel 43mm M3239010/BF04...
C$ 3,655
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Longines Ultra Chron oversized cal 431
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Longines Ultra Chron oversized cal 431
C$ 1,000
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203
NL
Rolex Day-Date Gold Bark Finish Wood Dial 18078
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Rolex Day-Date Gold Bark Finish Wood Dial 18078
C$ 20,727
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Watches & Jewellery of Bond Street Ltd
144
UK
Longines Ultra-Chron Factory Service & Warranty & Certificate
Longines Ultra-Chron Factory Service & Warranty & Certificate
C$ 2,850
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Horology 411
 
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Omega Speedmaster Moonwatch "Dark Side of the Moon" 311.92.44....
Omega Speedmaster Moonwatch "Dark Side of the Moon" 311.92.44....
C$ 9,429
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Crown & Caliber
10
US
Breitling Super Avenger II
Breitling Super Avenger II
C$ 5,965
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Lana's Jewelry
8
US
Breitling Navitimer World
Breitling Navitimer World
C$ 6,414
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Richard Engels Jewelers
 
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Omega Seamaster Planet Ocean Chronograph
Omega Seamaster Planet Ocean Chronograph
C$ 4,000
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Private Seller
CA
Breitling SuperOcean Heritage 38 Blue A37320 38mm Rubber...
Breitling SuperOcean Heritage 38 Blue A37320 38mm Rubber...
C$ 3,198
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Collectors Coins & Jewelry
 
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Breitling Avenger II Seawolf Yellow Black M17331E2/I530 LIMITED
Breitling Avenger II Seawolf Yellow Black M17331E2/I530 LIMITED
C$ 3,591
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Longines Ultra Chron
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Longines Ultra Chron
C$ 906
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203
NL
Rolex Day-Date Egyptian Oysterquartz 19028
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Rolex Day-Date Egyptian Oysterquartz 19028
C$ 21,629
Free shipping
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Watches & Jewellery of Bond Street Ltd
144
UK
Omega Seamaster Planet Ocean Chronograph
Omega Seamaster Planet Ocean Chronograph
C$ 6,985
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Dynamic Watches
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Rolex Day-Date 118239 Watch with 18k White Gold Bracelet and...
Rolex Day-Date 118239 Watch with 18k White Gold Bracelet and...
C$ 18,761
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Crown & Caliber
10
US
Tudor Heritage Black Bay Automatik Black 79230R Lederband
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Tudor Heritage Black Bay Automatik Black 79230R Lederband
C$ 4,248
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Uhren2000 GmbH
299
DE
Breitling Limited Edition Frecce Tricolori Chronomat 44 - 70...
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Breitling Limited Edition Frecce Tricolori Chronomat 44 - 70...
C$ 5,448
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Pawndeluxe
57
NL
Chronographe Suisse Cie Corol Antimagnetic chornagraph
Chronographe Suisse Cie Corol Antimagnetic chornagraph
C$ 1,799
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CA
Breitling MINT Men's Breitling Navitimer Chronograph 41.8mm...
Breitling MINT Men's Breitling Navitimer Chronograph 41.8mm...
C$ 4,995
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Chopard Chronograph Mille Miglia 8998 Jacky Ickx Limited Flyback
Chopard Chronograph Mille Miglia 8998 Jacky Ickx Limited Flyback
C$ 4,360
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Seiko King Seiko Hi-Beat Automatic Chronometer
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Seiko King Seiko Hi-Beat Automatic Chronometer
C$ 835
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203
NL
Rolex Sea-Dweller
Rolex Sea-Dweller
C$ 17,414
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Harley's Time LLC
46
US
Omega Speedmaster Professional Moonwatch
Omega Speedmaster Professional Moonwatch
C$ 9,878
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Dynamic Watches
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Breitling Chronomat Evolution C13356 Watch with 18k Rose Gold,...
Breitling Chronomat Evolution C13356 Watch with 18k Rose Gold,...
C$ 6,093
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Crown & Caliber
10
US
Panerai Luminor Marina PAM 00001 A Series T Swiss T Dial
Panerai Luminor Marina PAM 00001 A Series T Swiss T Dial
C$ 22,450
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Kronopassion
19
US
Omega Speedmaster Moonwatch Meteorite - watch on stock in Zurich
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Omega Speedmaster Moonwatch Meteorite - watch on stock in Zurich
C$ 13,851
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LUXURY TRADING ZURICH GMBH
11
CH
Omega Speedmaster Professional Moonwatch Speedmaster Dark Side...
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Omega Speedmaster Professional Moonwatch Speedmaster Dark Side...
C$ 10,904
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Private Seller
 
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Rolex MINT Men's 2016 Rolex Explorer I Black 39mm 214270...
Rolex MINT Men's 2016 Rolex Explorer I Black 39mm 214270...
C$ 7,047
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Breitling Avenger Automatic Rattrapante Chronograph - 06/25...
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Breitling Avenger Automatic Rattrapante Chronograph - 06/25...
C$ 13,817
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Pawndeluxe
57
NL
Rolex Air King
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Rolex Air King
C$ 5,386
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Vintage Watch Services
203
NL
Longines Hydro Conquest
Longines Hydro Conquest
C$ 1,263
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SIMARI GIOIELLI
6
IT
Omega Seamaster Planet Ocean Cegna Gold
Omega Seamaster Planet Ocean Cegna Gold
C$ 12,540
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Harley's Time LLC
46
US
Omega Seamaster Planet Ocean Titanium 600M 232.90.42.21.03.001...
Omega Seamaster Planet Ocean Titanium 600M 232.90.42.21.03.001...
C$ 6,190
Free shipping
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Crown & Caliber
10
US
Panerai Luminor Sealand Purdey PAM 845
Panerai Luminor Sealand Purdey PAM 845
C$ 19,242
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Kronopassion
19
US
Rolex GMT 2  Ref.16710 Bj.2007  (Z) Ungetragen LC100  NUR...
Rolex GMT 2 Ref.16710 Bj.2007 (Z) Ungetragen LC100 NUR...
C$ 31,581
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Uhren - Borgardts
 
DE
Omega Speedmaster '57
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Omega Speedmaster '57
C$ 6,350
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Private Seller
 
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IWC Classic Pilot Chronograph Black Day Date 42mm 3717 3717-01...
IWC Classic Pilot Chronograph Black Day Date 42mm 3717 3717-01...
C$ 5,507
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Collectors Coins & Jewelry
 
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Breitling Superocean II 42 Black Dial
Breitling Superocean II 42 Black Dial
C$ 2,566
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Cali Jewelers
US
Longines Ultra-Chron Automatic Oversized
TOP
Longines Ultra-Chron Automatic Oversized
C$ 864
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Vintage Watch Services
203
NL
Rolex Submariner
Rolex Submariner
C$ 15,790
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
124
DE
Panerai Radiomir Black Seal Logo PAM00380
Panerai Radiomir Black Seal Logo PAM00380
C$ 5,003
Free shipping
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Essence of Time, Inc.
22
US
Omega Seamaster Planet Ocean GMT 600M GoodPlanet 232.30.44.22....
Omega Seamaster Planet Ocean GMT 600M GoodPlanet 232.30.44.22....
C$ 6,029
Free shipping
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Crown & Caliber
10
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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