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Omega Seamaster 300 SPECTRE Limited Edition
Top
Omega Seamaster 300 SPECTRE Limited Edition
$9,780
Seller
Scorpio Luxury Corp
5
US
Breitling Super Avenger Chronograph SS A13370 Box/Papers
Top
Breitling Super Avenger Chronograph SS A13370 Box/Papers
$3,499
Seller
Phigora
62
US
Rolex Submariner Date
Top
Rolex Submariner Date
$9,500
Seller
Ari's Luxury Watch
 
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Omega Seamaster GMT 2535.80 Co-axial Automatic
Top
Omega Seamaster GMT 2535.80 Co-axial Automatic
$2,799
Seller
Phigora
62
US
Omega Seamaster  (16219)
Top
Omega Seamaster (16219)
$4,899
Free shipping
Seller
Chronostore
90
US
Paul Picot Atelier 18K Solid Gold Chronometer Rattrapante
Top
Paul Picot Atelier 18K Solid Gold Chronometer Rattrapante
$8,395
Seller
Swiss Moves
18
US
Rolex Lady-Presidential/Datejust
Top
Rolex Lady-Presidential/Datejust
$10,250
Free shipping
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The Castle Jewelry
 
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Bremont Martin-Baker Orange MBII/OR
Top
Bremont Martin-Baker Orange MBII/OR
$3,980
Free shipping
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The Luxury Well
35
US
Carl F. Bucherer Patravi Travelgraph 18k Yellow Gold GMT
Top
Carl F. Bucherer Patravi Travelgraph 18k Yellow Gold GMT
$6,500
Free shipping
Seller
Daniele Trissi
7
US
Omega Mens CONSTELLATION Day-Date 38 mm S/Steel & 18k Watch
Top
Omega Mens CONSTELLATION Day-Date 38 mm S/Steel & 18k Watch
$6,100
Seller
Fashion Ace, Inc
 
US
Rolex Datejust
Rolex Datejust
$8,200
Free shipping
Seller
LABELLE JEWELRY
 
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Omega Constellation Ref. 168.004 18k Gold Vintage
Omega Constellation Ref. 168.004 18k Gold Vintage
$8,100
Free shipping
Seller
Best Deals HD
 
US
Chopard Mille Miglia Gran Turismo XL 8997 Box & Papers
Top
Chopard Mille Miglia Gran Turismo XL 8997 Box & Papers
$3,499
Seller
Phigora
62
US
Omega Seamaster Planet Ocean
Top
Omega Seamaster Planet Ocean
$3,250
Seller
Private seller
 
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Breitling Crosswind Chronograph Windrider Racing Polished like...
Top
Breitling Crosswind Chronograph Windrider Racing Polished like...
$4,695
Seller
Swiss Moves
18
US
Rolex Oyster Perpetual Datejust
Rolex Oyster Perpetual Datejust
$6,950
Seller
WatchUWant.com
49
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
8
US
Rolex 41 Mm In Solid 18kt Rose Gold Diamonds
Rolex 41 Mm In Solid 18kt Rose Gold Diamonds
$59,999
Seller
Watch My Diamonds
37
US
Breitling Chronomat B01 HB0110
Breitling Chronomat B01 HB0110
$23,572
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Luxury Bazaar
31
US
Panerai Luminor Sealand Purdey PAM 845
Panerai Luminor Sealand Purdey PAM 845
$15,000
Seller
Kronopassion
 
US
Rolex 1680 Submariner 1680 TIFFANY & CO SS / Bracelet (26025)
Rolex 1680 Submariner 1680 TIFFANY & CO SS / Bracelet (26025)
$32,500
Seller
European Watch Company
50
US
Breitling Super Avenger Chronograph A13370 Box And Papers
Top
Breitling Super Avenger Chronograph A13370 Box And Papers
$3,399
Seller
Phigora
62
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
Breitling Montbrillant Navitimer Chronograph Polished Like NEW
Top
Breitling Montbrillant Navitimer Chronograph Polished Like NEW
$4,495
Seller
Swiss Moves
18
US
Omega Speedmaster "Dark Side of the Moon" 311.92.44.51...
Omega Speedmaster "Dark Side of the Moon" 311.92.44.51...
$6,950
Free shipping
Seller
Govberg Jewelers
125
US
Rolex Oyster Perpetual Datejust Copper Salmon Dial Steel Watch
Rolex Oyster Perpetual Datejust Copper Salmon Dial Steel Watch
$2,265
Seller
La Jolla Jewelry and Collateral Loan Company
8
US
Omega Constellation 1960s Chronometer 34mm Auto Stainless St...
Omega Constellation 1960s Chronometer 34mm Auto Stainless St...
$2,754
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GMTSKY
158
US
Rolex 116660Sea-Dweller DEEPSEA Stainless Steel&Ceramic...
Rolex 116660Sea-Dweller DEEPSEA Stainless Steel&Ceramic...
$12,949
Seller
Watch My Diamonds
37
US
Panerai Luminor 1950 PAM 127 E Series Special Editions
Panerai Luminor 1950 PAM 127 E Series Special Editions
$17,500
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Kronopassion
 
US
Rolex 16622 Yacht Master SS Platinum Bezel (26307)
Rolex 16622 Yacht Master SS Platinum Bezel (26307)
$11,200
Seller
European Watch Company
50
US
IWC Portofino IW391010 Chronograph Automatic Box & Papers
Top
IWC Portofino IW391010 Chronograph Automatic Box & Papers
$5,299
Seller
Phigora
62
US
Panerai Luminor 1950
Panerai Luminor 1950
$12,995
Seller
WatchUWant.com
49
US
Breitling Chronomat Evolution
Top
Breitling Chronomat Evolution
$6,200
Seller
Private seller
 
US
Rolex Day-Date President
Rolex Day-Date President
$11,995
Seller
BernardWatch.com
119
US
Rolex Oyster Perpetual Datejust Ref: 1601 Steel White Gold...
Rolex Oyster Perpetual Datejust Ref: 1601 Steel White Gold...
$3,795
Seller
La Jolla Jewelry and Collateral Loan Company
8
US
Breitling "A13356 Chronomat Evolution UTC GMT Chronograph&...
Breitling "A13356 Chronomat Evolution UTC GMT Chronograph&...
$4,250
Free shipping
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Miami Watch Company / PBC Inc
 
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
37
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
 
US
Rolex 1680 Submariner 1680 TIFFANY & CO SS / Bracelet...
Rolex 1680 Submariner 1680 TIFFANY & CO SS / Bracelet...
$27,900
Seller
European Watch Company
50
US
Omega Constellation 1202.10 Automatic 18K YG/SS
Top
Omega Constellation 1202.10 Automatic 18K YG/SS
$2,299
Seller
Phigora
62
US
Breitling Bentley 6.75
Breitling Bentley 6.75
$3,999
Free shipping
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White Glove Watch Company
 
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
22
US
Breitling Navitimer
Breitling Navitimer
$4,325
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BernardWatch.com
119
US
Omega Seamaster 300 Master Co-axial Stainless Steel Ref:...
Omega Seamaster 300 Master Co-axial Stainless Steel Ref:...
$4,245
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La Jolla Jewelry and Collateral Loan Company
8
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
53
US
Ulysse Nardin Marine Diver
Ulysse Nardin Marine Diver
$13,995
Seller
WatchUWant.com
49
US
Rolex Yacht-Master Oyster Perpetual Date Ladies 169622
Rolex Yacht-Master Oyster Perpetual Date Ladies 169622
$3,999
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Precision Watch & Clock
 
US
Rolex 116655 Yacht Master 18K Rose Gold / Rubber (26616)
Rolex 116655 Yacht Master 18K Rose Gold / Rubber (26616)
$20,500
Seller
European Watch Company
50
US
Rolex Oyster Perpetual Milgauss SS W/ Custom PVD 116400
Rolex Oyster Perpetual Milgauss SS W/ Custom PVD 116400
$8,699
Seller
Phigora
62
US
Rolex Yacht-Master II Edelstahl / Rosegold Ref. 116681
Top
Rolex Yacht-Master II Edelstahl / Rosegold Ref. 116681
$22,237
Seller
Uhren2000 GmbH
206
DE
Omega Seamaster Planet Ocean Chronograph 46mm Blue   Dial
Omega Seamaster Planet Ocean Chronograph 46mm Blue Dial
$5,495
Seller
The Watch Collector NY
 
US
Rolex Daytona Cosmograph
Rolex Daytona Cosmograph
$9,250
Seller
BernardWatch.com
119
US
Breitling Bentley Motors Diamonds Stainless Steel Automatic...
Breitling Bentley Motors Diamonds Stainless Steel Automatic...
$11,445
Seller
La Jolla Jewelry and Collateral Loan Company
8
US
Rolex Datejust Dark Rhodium Diamond Dial  126334 dkrdj
Rolex Datejust Dark Rhodium Diamond Dial 126334 dkrdj
$9,800
Seller
Sea Wave Diamonds
53
US
Rolex Oyster Perpetual Date
Rolex Oyster Perpetual Date
$9,995
Seller
WatchUWant.com
49
US
Omega Seamaster Diver Chronograph 300m 2296.80.00
Omega Seamaster Diver Chronograph 300m 2296.80.00
$3,950
Free shipping
Seller
Govberg Jewelers
125
US
Rolex 16613 Submariner 16613 18K / SS Silver Serti Dial NEW...
Rolex 16613 Submariner 16613 18K / SS Silver Serti Dial NEW...
$15,500
Seller
European Watch Company
50
US
Omega Speedmaster Chronograph 3211.3000 W/ Card
Top
Omega Speedmaster Chronograph 3211.3000 W/ Card
$2,699
Seller
Phigora
62
US
Rolex Datejust 41 Steel & White Gold Black Diamond Dial...
Rolex Datejust 41 Steel & White Gold Black Diamond Dial...
$10,499
Free shipping
Seller
Avi & Co NY
22
US
Omega SPEEDMASTER BROAD ARROW Ref. 3851.20.00/35512000
Top
Omega SPEEDMASTER BROAD ARROW Ref. 3851.20.00/35512000
$3,889
Seller
WINGOO WATCHES
180
IT
Breitling SuperOcean Heritage 46
Breitling SuperOcean Heritage 46
$2,850
Seller
BernardWatch.com
119
US
Rolex Oyster Perpetual Datejust Diamonds Stainless Steel Black...
Rolex Oyster Perpetual Datejust Diamonds Stainless Steel Black...
$4,645
Seller
La Jolla Jewelry and Collateral Loan Company
8
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.