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Rolex Daytona Grossular 116589SALV
TOP
Rolex Daytona Grossular 116589SALV
$124,782
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
144
UK
Rolex Daytona Diamond & Ruby Set 116589SALV
TOP
Rolex Daytona Diamond & Ruby Set 116589SALV
$120,504
Free shipping
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Watches & Jewellery of Bond Street Ltd
144
UK
Omega Speedmaster Moonphase Master Co-Axial Chronograph
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Omega Speedmaster Moonphase Master Co-Axial Chronograph
$8,340
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Juwelier Burger, since 2001
570
NL
Rolex Submariner Tropical 1680
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Rolex Submariner Tropical 1680
$42,069
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
$6,100
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Prestige Watch
103
US
Omega Men's Omega Seamaster Professional 300M 2561.80 Blue...
Omega Men's Omega Seamaster Professional 300M 2561.80 Blue...
$1,493
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Collectors Coins & Jewelry
 
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Omega Speedmaster Mark II Co-Axial Chronograph
Omega Speedmaster Mark II Co-Axial Chronograph
$3,773
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Horology 411
 
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Omega Grey Side of the Moon Speedmaster UNWORN
Omega Grey Side of the Moon Speedmaster UNWORN
$9,481
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LBA Exquisite Time Pieces
5
US
Breitling Navitimer World (A24322)
Breitling Navitimer World (A24322)
$3,999
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The Watch Movement
 
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Elgin 14k Muti-Tone Gold Elgin Antique Pocket Watch 1.5" Diameter
Elgin 14k Muti-Tone Gold Elgin Antique Pocket Watch 1.5" Diameter
$1,250
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Tangible Investments
 
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Breitling Avenger II Seawolf Yellow Black M17331E2/I530 LIMITED
Breitling Avenger II Seawolf Yellow Black M17331E2/I530 LIMITED
$2,999
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Alux 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...
$14,625
Free shipping
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Crown & Caliber
10
US
TAG Heuer Grand Carrera
TAG Heuer Grand Carrera
$2,700
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Andante Fine Jewelry
 
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Breitling Super Avenger II
Breitling Super Avenger II
$4,650
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Lana's Jewelry
8
US
Rolex 1972 Rolex Day-Date President 36mm 1803 18K Yellow Gold...
Rolex 1972 Rolex Day-Date President 36mm 1803 18K Yellow Gold...
$8,994
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Collectors Coins & Jewelry
 
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Rolex Date - Under Factory Warranty & Original Papers
Rolex Date - Under Factory Warranty & Original Papers
$5,950
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Horology 411
 
US
Breitling Navitimer World
Breitling Navitimer World
$5,000
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Richard Engels Jewelers
 
US
Breitling Chrono-Matic 1461 (A19360)
Breitling Chrono-Matic 1461 (A19360)
$3,999
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The Watch Movement
 
US
Rowe Bros. Chicago Rowe Bros 14k Gold 17 Jewel Antique
Rowe Bros. Chicago Rowe Bros 14k Gold 17 Jewel Antique
$1,250
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Tangible Investments
 
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Breitling Avenger II GMT Black PVD Steel 43mm M3239010/BF04...
Breitling Avenger II GMT Black PVD Steel 43mm M3239010/BF04...
$2,849
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Alux Watches
 
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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...
$3,300
Free shipping
Seller
Crown & Caliber
10
US
Omega Speedmaster Professional Moonwatch Speedmaster Dark Side...
TOP
Omega Speedmaster Professional Moonwatch Speedmaster Dark Side...
$8,500
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Private Seller
 
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Breitling Super Avenger II
Breitling Super Avenger II
$4,650
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Lana's Jewelry
8
US
Panerai 2011  PAM 111 Luminor Marina Manual Wind Black Rubber...
Panerai 2011 PAM 111 Luminor Marina Manual Wind Black Rubber...
$4,293
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Collectors Coins & Jewelry
 
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Longines Ultra-Chron Factory Service & Warranty & Certificate
Longines Ultra-Chron Factory Service & Warranty & Certificate
$2,222
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Horology 411
 
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Breitling Superocean II 42 Black Dial
Breitling Superocean II 42 Black Dial
$2,000
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Cali Jewelers
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Rolex Sea-Dweller
Rolex Sea-Dweller
$13,575
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Harley's Time LLC
46
US
Vacheron Constantin 18k White Gold Vintage Open Face 18 Jewel
Vacheron Constantin 18k White Gold Vintage Open Face 18 Jewel
$3,000
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Tangible Investments
 
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Omega Seamaster Ploprof White 1200m White  Rubber
Omega Seamaster Ploprof White 1200m White Rubber
$4,999
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Alux Watches
 
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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...
$3,825
Free shipping
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Crown & Caliber
10
US
Omega Speedmaster '57
TOP
Omega Speedmaster '57
$4,950
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Private Seller
 
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Breitling Super Avenger II
Breitling Super Avenger II
$4,650
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Lana's Jewelry
8
US
IWC 2017 IWC Pilot Midnight Mark XVIII 40mm Le Petit Prince...
IWC 2017 IWC Pilot Midnight Mark XVIII 40mm Le Petit Prince...
$3,393
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Collectors Coins & Jewelry
 
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Rolex Air King - Unpolished - Serviced & 3 Year Warranty
Rolex Air King - Unpolished - Serviced & 3 Year Warranty
$3,663
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Horology 411
 
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Breitling Navitimer 01 (46 MM)
Breitling Navitimer 01 (46 MM)
$19,999
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Cali Jewelers
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Panerai Radiomir Black Seal Logo PAM00380
Panerai Radiomir Black Seal Logo PAM00380
$3,900
Free shipping
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Essence of Time, Inc.
22
US
Rolex Cosmograph
Rolex Cosmograph
$23,500
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Tangible Investments
 
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Breitling Avenger II Seawolf Yellow Black M17331E2/I530 LIMITED
Breitling Avenger II Seawolf Yellow Black M17331E2/I530 LIMITED
$2,799
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Alux Watches
 
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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....
$7,350
Free shipping
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Crown & Caliber
10
US
Rolex Oyster Perpetual Day-Date
TOP
Rolex Oyster Perpetual Day-Date
$22,000
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Private Seller
 
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Omega Seamaster Planet Ocean Cegna Gold 215.63.46.22.01.001
Omega Seamaster Planet Ocean Cegna Gold 215.63.46.22.01.001
$9,775
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Harley's Time LLC
46
US
IWC MINT IWC Portuguese Chronograph Stainless Blue 41mm 3714...
IWC MINT IWC Portuguese Chronograph Stainless Blue 41mm 3714...
$4,894
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Collectors Coins & Jewelry
 
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Rolex Explorer II Steve McQueen 1655
TOP
Rolex Explorer II Steve McQueen 1655
$28,450
Free shipping
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Watches & Jewellery of Bond Street Ltd
144
UK
Breitling Navitimer Limited Edition
Breitling Navitimer Limited Edition
$8,000
Free shipping
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Joyce's Fine Jewelry
 
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Rolex 16710 GMT Master II SS Red / Blue Pepsi Bezel FULL SET...
Rolex 16710 GMT Master II SS Red / Blue Pepsi Bezel FULL SET...
$11,900
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European Watch Company
113
US
Rolex Sea-Dweller Deepsea 116660 D-Blue
Rolex Sea-Dweller Deepsea 116660 D-Blue
Price on request
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Watch Trading Company
7
US
Chopard Chronograph Mille Miglia 8998 Jacky Ickx Limited Flyback
Chopard Chronograph Mille Miglia 8998 Jacky Ickx Limited Flyback
$3,399
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Alux Watches
 
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Omega De Ville 431.33.41.21.03.001 Watch with Leather Bracelet...
Omega De Ville 431.33.41.21.03.001 Watch with Leather Bracelet...
$3,450
Free shipping
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Crown & Caliber
10
US
Omega Seamaster 300 Master Co-axial 41mm
TOP
Omega Seamaster 300 Master Co-axial 41mm
$5,000
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Private Seller
 
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Omega Constellation C-Shape
TOP
Omega Constellation C-Shape
$1,053
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Vintage Watch Services
203
NL
Rolex RARE Green Panna Cream Dial Rolex Daytona Cosmograph...
Rolex RARE Green Panna Cream Dial Rolex Daytona Cosmograph...
$22,993
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Collectors Coins & Jewelry
 
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Zenith El Primero Rattrapante Chronograph
Zenith El Primero Rattrapante Chronograph
$9,800
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WatchWorks Fine Watches & Accessories
11
US
Breitling Chronomat 44
Breitling Chronomat 44
$4,500
Free shipping
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Joyce's Fine Jewelry
 
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Rolex 116600 Sea Dweller 4000 SS/SS DISCONTINUED UNWORN (28327)
Rolex 116600 Sea Dweller 4000 SS/SS DISCONTINUED UNWORN (28327)
$12,900
Seller
European Watch Company
113
US
Rolex Datejust 41mm 126334 rhodium diamond dial oyster bracelet
Rolex Datejust 41mm 126334 rhodium diamond dial oyster bracelet
$10,450
Seller
Watch Trading Company
7
US
Rolex Datejust
Rolex Datejust
$9,450
Free shipping
Seller
SLS TIME
32
US
Omega Seamaster 300M 2254.50.00 Watch with Stainless Steel...
Omega Seamaster 300M 2254.50.00 Watch with Stainless Steel...
$2,400
Free shipping
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Crown & Caliber
10
US
Breitling Montbrillant
TOP
Breitling Montbrillant
$4,150
Seller
Private Seller
 
US
Breitling Chrono-Matic 49
Breitling Chrono-Matic 49
$5,400
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Cali Jewelers
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Rolex 2014 Rolex GMT-Master II Stainless Black PVD Ceramic...
Rolex 2014 Rolex GMT-Master II Stainless Black PVD Ceramic...
$8,794
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Collectors Coins & Jewelry
 
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Rolex Day-Date Gold Bark Finish Wood Dial 18078
TOP
Rolex Day-Date Gold Bark Finish Wood Dial 18078
$16,400
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
144
UK
Breitling Transocean Automatic Chronograph
Breitling Transocean Automatic Chronograph
$6,945
Free shipping
Seller
Essence of Time, Inc.
22
US
Rolex 16750 GMT Master Transitional "Pepsi Bezel" Matte Dial...
Rolex 16750 GMT Master Transitional "Pepsi Bezel" Matte Dial...
$15,500
Seller
European Watch Company
113
US
Chopard Two O Ten Tycoon Chronograph Steel Automatic Mens...
Chopard Two O Ten Tycoon Chronograph Steel Automatic Mens...
$4,250
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Jewels in Time
26
US
Omega Seamaster 300
Omega Seamaster 300
$4,150
Free shipping
Seller
SLS TIME
32
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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