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Sinn 103 St Sa RB Classic Watch Sondermodell
TOP
Sinn 103 St Sa RB Classic Watch Sondermodell
$2,867
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Classic Watch
 
DE
Sinn 956 Klassik
TOP
Sinn 956 Klassik
$3,467
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Classic Watch
 
DE
Breitling Crosswind Chronograph Windrider Racing Polished like...
TOP
Breitling Crosswind Chronograph Windrider Racing Polished like...
$4,695
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Swiss Moves
22
US
Panerai Luminor  1950 Limited Edition PAM127/ OP6576 FIDDY
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Panerai Luminor 1950 Limited Edition PAM127/ OP6576 FIDDY
$12,999
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Phigora
63
US
Rolex Submariner Date
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Rolex Submariner Date
$9,500
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Ari's Luxury Watch
 
US
Omega Seamaster Planet Ocean Blue Steel 44mm
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Omega Seamaster Planet Ocean Blue Steel 44mm
$4,295
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The Watch Collector NY
 
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Carl F. Bucherer Patravi Travelgraph 18k Yellow Gold GMT
TOP
Carl F. Bucherer Patravi Travelgraph 18k Yellow Gold GMT
$6,500
Free shipping
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Daniele Trissi
8
US
Omega : Constellation Co-Axial 38MM :  123.10.38.21.01.002 : ...
TOP
Omega : Constellation Co-Axial 38MM : 123.10.38.21.01.002 : ...
$3,190
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BernardWatch.com
129
US
Rolex 16610LV 16610 LV "FLAT 4" Submariner 50th...
Rolex 16610LV 16610 LV "FLAT 4" Submariner 50th...
$17,900
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European Watch Company
56
US
Breitling Chronomat 44 Flying Fish Stainless Steel
TOP
Breitling Chronomat 44 Flying Fish Stainless Steel
$4,195
Free shipping
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AJ Watches
35
US
Omega Constellation Ref. 168.004 18k Gold Vintage
Omega Constellation Ref. 168.004 18k Gold Vintage
$7,900
Free shipping
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Best Deals HD
 
US
Omega Constellation Swiss Made Men's Automatic 35mm...
Omega Constellation Swiss Made Men's Automatic 35mm...
$2,238
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GMTSKY
174
US
Rolex Oyster Perpetual GMT-Master 16753
TOP
Rolex Oyster Perpetual GMT-Master 16753
$7,499
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Phigora
63
US
Rolex 116660Sea-Dweller DEEPSEA Stainless Steel&Ceramic...
Rolex 116660Sea-Dweller DEEPSEA Stainless Steel&Ceramic...
$12,949
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Watch My Diamonds
44
US
Rolex Seadweller 126600 43MM Ceramic New Model Not in Stores Rare
Rolex Seadweller 126600 43MM Ceramic New Model Not in Stores Rare
$16,995
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The Watch Collector NY
 
US
Panerai Luminor Marina PAM 00001 A Series T Swiss T Dial
Panerai Luminor Marina PAM 00001 A Series T Swiss T Dial
$17,500
Seller
Kronopassion
5
US
Breitling : Navitimer :  A23322 :  Stainless Steel
Breitling : Navitimer : A23322 : Stainless Steel
$4,325
Seller
BernardWatch.com
129
US
Rolex Datejust 41 Steel & White Gold Blue Diamond Dial...
Rolex Datejust 41 Steel & White Gold Blue Diamond Dial...
$10,699
Free shipping
Seller
Avi & Co NY
25
US
Rolex 1680 Submariner 1680 TIFFANY & CO SS / Bracelet (26025)
Rolex 1680 Submariner 1680 TIFFANY & CO SS / Bracelet (26025)
$32,500
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European Watch Company
56
US
Breitling Chronomat Evolution B13356 18k Gold & Steel
Breitling Chronomat Evolution B13356 18k Gold & Steel
$4,000
Free shipping
Seller
Best Deals HD
 
US
Ulysse Nardin Marine Diver
Ulysse Nardin Marine Diver
$13,995
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WatchUWant.com
52
US
Rolex Oyster Perpetual 6565 Yellow Gold Automatic
TOP
Rolex Oyster Perpetual 6565 Yellow Gold Automatic
$6,399
Seller
Phigora
63
US
Rolex Datejust Turn-o-graph White Dial Rolex Ref 116263 Steel ...
Rolex Datejust Turn-o-graph White Dial Rolex Ref 116263 Steel ...
$5,690
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Watch My Diamonds
44
US
Omega Seamaster Planet Ocean Chronograph 46mm Blue   Dial
Omega Seamaster Planet Ocean Chronograph 46mm Blue Dial
$5,495
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The Watch Collector NY
 
US
Panerai Luminor Sealand Purdey PAM 845
Panerai Luminor Sealand Purdey PAM 845
$15,000
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Kronopassion
5
US
Rolex : GMT-Master II :  16710 :  Stainless Steel : black...
Rolex : GMT-Master II : 16710 : Stainless Steel : black...
$7,205
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BernardWatch.com
129
US
Rolex Datejust 41 Steel & White Gold Black Diamond Dial...
Rolex Datejust 41 Steel & White Gold Black Diamond Dial...
$10,699
Free shipping
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Avi & Co NY
25
US
Rolex 116600 116600 Sea Dweller 4000 SS DISCONTINUED (26614)
Rolex 116600 116600 Sea Dweller 4000 SS DISCONTINUED (26614)
$11,400
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European Watch Company
56
US
Omega Seamaster Diver 300 M Basickly a NEW watch super mint
Omega Seamaster Diver 300 M Basickly a NEW watch super mint
$2,850
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Sea Wave Diamonds
60
US
Omega Seamaster 300m James Bond Spectre Limited Edition...
Omega Seamaster 300m James Bond Spectre Limited Edition...
$9,950
Free shipping
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Govberg Jewelers
148
US
Rolex Oyster Perpetual Submariner 16610 Date Stainless Steel
Rolex Oyster Perpetual Submariner 16610 Date Stainless Steel
$5,999
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Phigora
63
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Rolex Sky-dweller 18k Yellow Gold 42mm Champagne Arabic Dial...
Rolex Sky-dweller 18k Yellow Gold 42mm Champagne Arabic Dial...
$79,999
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Watch My Diamonds
44
US
Omega Seamaster Planet Ocean
TOP
Omega Seamaster Planet Ocean
$3,250
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Private seller
 
US
Rolex Datejust
Rolex Datejust
$8,100
Free shipping
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LABELLE JEWELRY
 
US
Rolex : Sea-Dweller 43mm :  126600 :  Stainless Steel : black...
Rolex : Sea-Dweller 43mm : 126600 : Stainless Steel : black...
$14,210
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BernardWatch.com
129
US
Omega Seamaster Planet Ocean 600M Co-Axial Chronograph
Omega Seamaster Planet Ocean 600M Co-Axial Chronograph
$4,995
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WatchUWant.com
52
US
Rolex 1680 Submariner 1680 TIFFANY & CO SS / Bracelet...
Rolex 1680 Submariner 1680 TIFFANY & CO SS / Bracelet...
$27,900
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European Watch Company
56
US
Rolex Sea-Dweller
Rolex Sea-Dweller
$7,250
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Sea Wave Diamonds
60
US
Panerai PAM 217 Destro Marina Militare Special Edition
Panerai PAM 217 Destro Marina Militare Special Edition
$18,500
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Kronopassion
5
US
Omega Constellation Automatic 368.1201 Gold & Steel
TOP
Omega Constellation Automatic 368.1201 Gold & Steel
$2,399
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Phigora
63
US
Rolex Daytona Sodalite Dial White Gold
TOP
Rolex Daytona Sodalite Dial White Gold
$86,997
Free shipping
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Watches & Jewellery of Bond Street Ltd
66
UK
Mido Rare Ocean Star Chronometer Swiss Made Luxury Automatic...
Mido Rare Ocean Star Chronometer Swiss Made Luxury Automatic...
$1,606
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GMTSKY
174
US
Rolex Datejust
Rolex Datejust
$8,100
Free shipping
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LABELLE JEWELRY
 
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Rolex : GMT-Master II :  16710 :  Stainless Steel : black...
Rolex : GMT-Master II : 16710 : Stainless Steel : black...
$7,675
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BernardWatch.com
129
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Rolex Oyster Perpetual Datejust
Rolex Oyster Perpetual Datejust
$7,950
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WatchUWant.com
52
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Rolex 16610LV 16610 LV Submariner 50th Anniversary SS Green...
Rolex 16610LV 16610 LV Submariner 50th Anniversary SS Green...
$11,440
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European Watch Company
56
US
Rolex Datejust Pave Red Roman Diamond Dial Stainless Steel And...
Rolex Datejust Pave Red Roman Diamond Dial Stainless Steel And...
$6,499
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Watch My Diamonds
44
US
Breitling Navitimer 1461 Chronograph
Breitling Navitimer 1461 Chronograph
$6,950
Seller
Kronopassion
5
US
Omega Speedmaster Broad Arrow 3575.20.00 Moonphase
TOP
Omega Speedmaster Broad Arrow 3575.20.00 Moonphase
$3,999
Seller
Phigora
63
US
Rolex Gmt Master  Ref:16700 Stainless Steel Blue Red Pepsi...
Rolex Gmt Master Ref:16700 Stainless Steel Blue Red Pepsi...
$8,645
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La Jolla Jewelry and Collateral Loan Company
16
US
Omega Seamaster 300 Retro Master Co-Axial Steel 41 mm
Omega Seamaster 300 Retro Master Co-Axial Steel 41 mm
$4,195
Seller
The Watch Collector NY
 
US
Omega Seamaster Bullhead Ref 225.12.43.50.01.001 Co-Axial...
Omega Seamaster Bullhead Ref 225.12.43.50.01.001 Co-Axial...
$5,500
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FeelGoodWatches, Inc.
US
Omega : Seamaster Diver 300M :  212.30.41.20.01.003 : ...
Omega : Seamaster Diver 300M : 212.30.41.20.01.003 : ...
$2,695
Seller
BernardWatch.com
129
US
Breitling Chronomat 44
Breitling Chronomat 44
$6,495
Seller
WatchUWant.com
52
US
Rolex 16523 16523 Zenith Daytona Cosmograph 2 Tone "Last...
Rolex 16523 16523 Zenith Daytona Cosmograph 2 Tone "Last...
$13,900
Seller
European Watch Company
56
US
Rolex 118138 Perpetual Day-Date 18K Yellow Gold Unisex Watch
Rolex 118138 Perpetual Day-Date 18K Yellow Gold Unisex Watch
$17,450
Seller
Watch My Diamonds
44
US
Breitling Chronomat GMT 44 CB042012/BB86
Breitling Chronomat GMT 44 CB042012/BB86
$6,950
Free shipping
Seller
Govberg Jewelers
148
US
IWC Portofino IW391010 Chronograph Automatic Box & Papers
TOP
IWC Portofino IW391010 Chronograph Automatic Box & Papers
$5,299
Seller
Phigora
63
US
Rolex Oyster Perpetual Datejust Gold Steel Diamond Watch
Rolex Oyster Perpetual Datejust Gold Steel Diamond Watch
$4,745
Seller
La Jolla Jewelry and Collateral Loan Company
16
US
Breitling Colt Quartz
Breitling Colt Quartz
$1,500
Seller
Golda Co.
8
US
Cartier Roadster Chronograph XL 18K Solid Yellow Gold
Cartier Roadster Chronograph XL 18K Solid Yellow Gold
$19,999
Free shipping
Seller
Loucri Jewelers
28
US
Omega : Seamaster 300 Master Co-Axial :  233.30.41.21.01.001 :...
Omega : Seamaster 300 Master Co-Axial : 233.30.41.21.01.001 :...
$4,220
Seller
BernardWatch.com
129
US

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.