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Breitling Chronomat Evolution Blue 44MM Stunning Condition
TOP
Breitling Chronomat Evolution Blue 44MM Stunning Condition
$3,445
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Swiss Moves
24
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Breitling Avenger II Seawolf A1733110.F563.169A
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Breitling Avenger II Seawolf A1733110.F563.169A
$3,572
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Uhren2000 GmbH
219
DE
Rolex Submariner Date
Rolex Submariner Date
$6,400
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Breitling Crosswind Chronograph Windrider Racing Polished like...
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Breitling Crosswind Chronograph Windrider Racing Polished like...
$4,695
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Swiss Moves
24
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Panerai Luminor  1950 Limited Edition PAM127/ OP6576 FIDDY
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Panerai Luminor 1950 Limited Edition PAM127/ OP6576 FIDDY
$12,499
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Phigora
73
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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
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Carl F. Bucherer Patravi Travelgraph 18k Yellow Gold GMT
$6,500
Free shipping
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Daniele Trissi
10
US
Omega Seamaster Aqua Terra GMT
Omega Seamaster Aqua Terra GMT
$4,397
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Rocky Mountain Pawn Ltd.
CA
Breitling Chronomat 47 GMT Stainless Steel
TOP
Breitling Chronomat 47 GMT Stainless Steel
$4,895
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AJ Watches
44
US
Omega Seamaster Aqua Terra
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Omega Seamaster Aqua Terra
$4,162
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Scorpio Luxury Corp
6
US
Breitling : Navitimer :  A23322 :  Stainless Steel
Breitling : Navitimer : A23322 : Stainless Steel
$4,325
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BernardWatch.com
138
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Rolex 116660Sea-Dweller DEEPSEA Stainless Steel&Ceramic...
Rolex 116660Sea-Dweller DEEPSEA Stainless Steel&Ceramic...
$12,949
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Watch My Diamonds
48
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Panerai Luminor Marina PAM 00001 A Series T Swiss T Dial
Panerai Luminor Marina PAM 00001 A Series T Swiss T Dial
$17,500
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Kronopassion
6
US
Omega Constellation Double Eagle Co-Axial 15195100 Box &...
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Omega Constellation Double Eagle Co-Axial 15195100 Box &...
$4,299
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Phigora
73
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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
Rolex Datejust 41 Steel & White Gold Blue Diamond Dial...
Rolex Datejust 41 Steel & White Gold Blue Diamond Dial...
$10,499
Free shipping
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Avi & Co NY
32
US
Breitling Bentley 6.75
Breitling Bentley 6.75
$4,731
Free shipping
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Rocky Mountain Pawn Ltd.
CA
Breitling Chronomat 44 Flying Fish Stainless Steel
TOP
Breitling Chronomat 44 Flying Fish Stainless Steel
$4,195
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AJ Watches
44
US
Rolex 1680 Submariner 1680 TIFFANY & CO SS / Bracelet (26025)
Rolex 1680 Submariner 1680 TIFFANY & CO SS / Bracelet (26025)
$28,500
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European Watch Company
64
US
Ulysse Nardin Marine Diver
Ulysse Nardin Marine Diver
$13,995
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WatchBox
53
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
48
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Panerai Luminor Sealand Purdey PAM 845
Panerai Luminor Sealand Purdey PAM 845
$15,000
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Kronopassion
6
US
Omega Speedmaster Broad Arrow 3575.20.00 Moonphase
TOP
Omega Speedmaster Broad Arrow 3575.20.00 Moonphase
$3,599
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Phigora
73
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
 
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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
32
US
Sinn 144 St Sa
TOP
Sinn 144 St Sa
$2,258
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Classic Watch
 
DE
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
70
US
Rolex 116710LN GMT Master II Ceramic SS (26852)
Rolex 116710LN GMT Master II Ceramic SS (26852)
$7,350
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European Watch Company
64
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
157
US
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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48
US
Omega Seamaster Planet Ocean
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Omega Seamaster Planet Ocean
$3,250
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Private seller
 
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Rolex Vintage Rolex Bubble Back 3130 Cartier Dial
Rolex Vintage Rolex Bubble Back 3130 Cartier Dial
$3,999
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Phigora
73
US
Tudor : Heritage Black Bay S&G :  79733N :  Stainless...
Tudor : Heritage Black Bay S&G : 79733N : Stainless...
$4,530
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BernardWatch.com
138
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Panerai PAM 217 Destro Marina Militare Special Edition
Panerai PAM 217 Destro Marina Militare Special Edition
$18,500
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Kronopassion
6
US
Rolex Oyster Perpetual Datejust
Rolex Oyster Perpetual Datejust
$7,950
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WatchBox
53
US
Rolex Sea-Dweller
Rolex Sea-Dweller
$7,250
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Sea Wave Diamonds
70
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Omega 311.92.44.51.01.006 Dark Side of the Moon Vintage Black...
Omega 311.92.44.51.01.006 Dark Side of the Moon Vintage Black...
$7,850
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European Watch Company
64
US
Omega Seamaster 300 Retro Master Co-Axial Steel 41 mm
Omega Seamaster 300 Retro Master Co-Axial Steel 41 mm
$4,195
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The Watch Collector NY
 
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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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48
US
Breitling Chronomat GMT 44 CB042012/BB86
Breitling Chronomat GMT 44 CB042012/BB86
$6,950
Free shipping
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Govberg Jewelers
157
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Rolex Oyster Perpetual Submariner 16610 Black PVD
Rolex Oyster Perpetual Submariner 16610 Black PVD
$8,499
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Phigora
73
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Breitling : Chronomat 41 Limited :  AB014112/BB47-378A : ...
Breitling : Chronomat 41 Limited : AB014112/BB47-378A : ...
$4,425
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BernardWatch.com
138
US
Breitling Navitimer 1461 Chronograph
Breitling Navitimer 1461 Chronograph
$6,950
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Kronopassion
6
US
Breitling Chronomat 44
Breitling Chronomat 44
$6,495
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WatchBox
53
US
Rolex Day-Date President Platium Watch 18206
Rolex Day-Date President Platium Watch 18206
$19,995
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Diamond Box, Inc. DBA Solitaire Bridal & Estate Jewellers
 
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Rolex 1680 Submariner 1680 TIFFANY & CO SS / Bracelet...
Rolex 1680 Submariner 1680 TIFFANY & CO SS / Bracelet...
$23,500
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European Watch Company
64
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Rolex Oyster Perpetual Day-Date
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Rolex Oyster Perpetual Day-Date
$22,000
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Private seller
 
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Rolex 118138 Perpetual Day-Date 18K Yellow Gold Unisex Watch
Rolex 118138 Perpetual Day-Date 18K Yellow Gold Unisex Watch
$17,450
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Watch My Diamonds
48
US
Omega Seamaster Planet Ocean 232.32.46.51.01.001
Omega Seamaster Planet Ocean 232.32.46.51.01.001
$4,950
Free shipping
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Govberg Jewelers
157
US
Rolex Daytona Cosmograph 116519 18k White Gold
Rolex Daytona Cosmograph 116519 18k White Gold
$15,299
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Phigora
73
US
Omega : Seamaster Diver 300M :  212.30.41.20.03.001 : ...
Omega : Seamaster Diver 300M : 212.30.41.20.03.001 : ...
$3,085
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BernardWatch.com
138
US
Breitling Colt Quartz
Breitling Colt Quartz
$1,500
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Golda Co.
9
US
Breitling TransOcean 38 Chronograph
Breitling TransOcean 38 Chronograph
$5,995
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WatchBox
53
US
Rolex Day-Date President 18K Yellow Gold Double Quick 18238
Rolex Day-Date President 18K Yellow Gold Double Quick 18238
$12,500
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Diamond Box, Inc. DBA Solitaire Bridal & Estate Jewellers
 
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Rolex 16613 Submariner 16613 18K / SS Silver Serti Dial NEW...
Rolex 16613 Submariner 16613 18K / SS Silver Serti Dial NEW...
$13,500
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European Watch Company
64
US
Cartier Roadster Chronograph XL 18K Solid Yellow Gold
Cartier Roadster Chronograph XL 18K Solid Yellow Gold
$19,999
Free shipping
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Loucri Jewelers
32
US
Rolex Diamond Rolex Sky-dweller 18k Yellow Gold 42mm Silver...
Rolex Diamond Rolex Sky-dweller 18k Yellow Gold 42mm Silver...
$84,999
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Watch My Diamonds
48
US
Omega Seamaster Diver Chronograph Blue Dial 42mm
Omega Seamaster Diver Chronograph Blue Dial 42mm
$3,795
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The Watch Collector NY
 
US
Rolex Oyster Perpetual Milgauss SS W/ Custom PVD 116400
Rolex Oyster Perpetual Milgauss SS W/ Custom PVD 116400
$8,699
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Phigora
73
US
Breitling : Chrono Avenger :  E13360 :  Titanium
Breitling : Chrono Avenger : E13360 : Titanium
$3,085
Seller
BernardWatch.com
138
US
Omega stainless steel Seamaster Aqua Terra
Omega stainless steel Seamaster Aqua Terra
$2,200
Seller
Paul Duggan Co., Inc
45
US
Breitling Navitimer 01
Breitling Navitimer 01
$6,495
Seller
WatchBox
53
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.