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Breitling Super Avenger Chronograph A13370 Box And Papers
Breitling Super Avenger Chronograph A13370 Box And Papers
$3,399
Seller
Phigora
59
US
Rolex Datejust 41 Steel & White Gold Blue Diamond Dial...
Rolex Datejust 41 Steel & White Gold Blue Diamond Dial...
$10,499
Free shipping
Seller
Avi & Co NY
21
US
Montblanc Timewalker Twinfly Greytech Titanium Chrono
Montblanc Timewalker Twinfly Greytech Titanium Chrono
$6,000
Seller
Private seller
 
US
Rolex Oyster Perpetual Submariner 16610 Date Stainless Steel
Rolex Oyster Perpetual Submariner 16610 Date Stainless Steel
$5,799
Seller
Phigora
59
US
Omega Seamaster 300 M Chronometer 2531.80  41mm
Omega Seamaster 300 M Chronometer 2531.80 41mm
$1,975
Seller
PreOwned Watch Shop
8
US
Paul Picot Atelier 18K Solid Gold Chronometer Rattrapante
Paul Picot Atelier 18K Solid Gold Chronometer Rattrapante
$9,795
Seller
Swiss Moves
18
US
Omega Seamaster Planet Ocean Blue Steel 44mm
Omega Seamaster Planet Ocean Blue Steel 44mm
$4,295
Seller
The Watch Collector NY
 
US
Omega Seamaster  (16219)
Omega Seamaster (16219)
$4,899
Free shipping
Seller
Chronostore
87
US
Chopard 1000 Mille Miglia GMT Chrono  S. Steel  Box & Paper
Chopard 1000 Mille Miglia GMT Chrono S. Steel Box & Paper
$2,977
Seller
Royal Jewelry & Watches
14
US
Rolex Oyster Perpetual Datejust Stainless Steel White Gold Watch
Rolex Oyster Perpetual Datejust Stainless Steel White Gold Watch
$3,345
Seller
La Jolla Jewelry and Collateral Loan Company
7
US
Rolex - Day-Date President : 18238
Rolex - Day-Date President : 18238
$11,995
Seller
BernardWatch.com
97
US
Rolex Sea-Dweller Deepsea
Rolex Sea-Dweller Deepsea
$12,000
Seller
Private seller
 
US
Rolex Oyster Perpetual Datejust 18K YG & SS 16233G
Rolex Oyster Perpetual Datejust 18K YG & SS 16233G
$4,899
Seller
Phigora
59
US
Chopard Mille Miglia GMT, Ref 8992
Chopard Mille Miglia GMT, Ref 8992
$3,775
Seller
PreOwned Watch Shop
8
US
Breitling Crosswind Chronograph Windrider Racing Polished like...
Breitling Crosswind Chronograph Windrider Racing Polished like...
$4,695
Seller
Swiss Moves
18
US
Rolex Day-Date II / President II
Rolex Day-Date II / President II
$28,995
Seller
Watcheslikenew.com
 
US
Breitling Bentley 6.75
Breitling Bentley 6.75
$4,800
Free shipping
Seller
White Glove Watch Company
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
44
US
Rolex Oyster Perpetual Datejust Stainless Steel Silver Face...
Rolex Oyster Perpetual Datejust Stainless Steel Silver Face...
$3,345
Seller
La Jolla Jewelry and Collateral Loan Company
7
US
Rolex - Datejust : 16234 gray tapestry dial on Jubilee bracelet
Rolex - Datejust : 16234 gray tapestry dial on Jubilee bracelet
$3,295
Seller
BernardWatch.com
97
US
Omega Seamaster Diver 300 M
Omega Seamaster Diver 300 M
$2,200
Seller
Private seller
 
US
Omega Constellation 1202.10 Automatic 18K YG/SS
Omega Constellation 1202.10 Automatic 18K YG/SS
$2,299
Seller
Phigora
59
US
Omega "Olympic Games Collection" Planet Ocean
Omega "Olympic Games Collection" Planet Ocean
$4,725
Seller
PreOwned Watch Shop
8
US
Breitling Montbrillant Navitimer Chronograph Polished Like NEW
Breitling Montbrillant Navitimer Chronograph Polished Like NEW
$4,495
Seller
Swiss Moves
18
US
Rolex Yacht-Master
Rolex Yacht-Master
$9,995
Seller
Watcheslikenew.com
 
US
Rolex Sky-dweller 18k Yellow Gold 42mm Champagne Arabic Dial...
Rolex Sky-dweller 18k Yellow Gold 42mm Champagne Arabic Dial...
$79,999
Seller
Watch My Diamonds
31
US
Rolex 116719BLRO GMT Master II Blue / Red 18K White Gold (26378)
Rolex 116719BLRO GMT Master II Blue / Red 18K White Gold (26378)
$25,500
Seller
European Watch Company
44
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
7
US
Tudor - Heritage Black Bay Chronograph : 79350
Tudor - Heritage Black Bay Chronograph : 79350
$4,695
Seller
BernardWatch.com
97
US
Omega Seamaster Diver 300 M
Omega Seamaster Diver 300 M
$2,600
Seller
Private seller
 
US
Rolex Oyster Perpetual Datejust 16013 Blue Dial
Rolex Oyster Perpetual Datejust 16013 Blue Dial
$4,199
Seller
Phigora
59
US
Panerai Luminor GMT PAM 00159
Panerai Luminor GMT PAM 00159
$4,875
Seller
PreOwned Watch Shop
8
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
Seller
The Watch Collector NY
 
US
Ulysse Nardin Maxi-Marine ref. 263-66-3-62 Mens Automatic...
Ulysse Nardin Maxi-Marine ref. 263-66-3-62 Mens Automatic...
$3,980
Seller
FeelGoodWatches, 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
Seller
Watch My Diamonds
31
US
Rolex 16622 Yacht Master SS Platinum Bezel 'NEW OLD...
Rolex 16622 Yacht Master SS Platinum Bezel 'NEW OLD...
$11,200
Seller
European Watch Company
44
US
Rolex Oyster Perpetual Datejust Yellow Gold Stainless Steel...
Rolex Oyster Perpetual Datejust Yellow Gold Stainless Steel...
$3,885
Seller
La Jolla Jewelry and Collateral Loan Company
7
US
Rolex - Day-Date President ''Oyster'' : 118205
Rolex - Day-Date President ''Oyster'' : 118205
$16,250
Seller
BernardWatch.com
97
US
TAG Heuer Carrera Calibre 8
TAG Heuer Carrera Calibre 8
$3,000
Seller
Private seller
 
US
Rolex Daytona Cosmograph Stainless Steel 116520
Rolex Daytona Cosmograph Stainless Steel 116520
$11,299
Seller
Phigora
59
US
Omega Seamaster 300 M Midsize Chronometer 2551.80
Omega Seamaster 300 M Midsize Chronometer 2551.80
$1,615
Seller
PreOwned Watch Shop
8
US
Breitling Bentley
Breitling Bentley
$6,295
Free shipping
Seller
Diamonds by Raymond Lee
US
Panerai Luminor Sealand Purdey PAM 845
Panerai Luminor Sealand Purdey PAM 845
$15,000
Seller
Kronopassion
 
US
Rolex Datejust Dark Rhodium Diamond Dial  126334 dkrdj
Rolex Datejust Dark Rhodium Diamond Dial 126334 dkrdj
$9,800
Seller
Sea Wave Diamonds
44
US
Ulysse Nardin Maxi Marine Diver
Ulysse Nardin Maxi Marine Diver
$19,995
Seller
Watcheslikenew.com
 
US
Rolex Datejust Diamonds Mother Of Pearl White Gold Stainless...
Rolex Datejust Diamonds Mother Of Pearl White Gold Stainless...
$4,515
Seller
La Jolla Jewelry and Collateral Loan Company
7
US
Omega - Seamaster Planet Ocean : 232.32.42.21.01.005
Omega - Seamaster Planet Ocean : 232.32.42.21.01.005
$3,295
Seller
BernardWatch.com
97
US
Rolex Air King 18k White Gold Bezel
Rolex Air King 18k White Gold Bezel
$4,150
Seller
Private seller
 
US
Omega DeVille Co-Axial Chronograph  4841.31.32
Omega DeVille Co-Axial Chronograph 4841.31.32
$2,895
Seller
PreOwned Watch Shop
8
US
Breitling Superocean Heritage A1732124/BA61
Breitling Superocean Heritage A1732124/BA61
$2,950
Free shipping
Seller
Govberg Jewelers
119
US
Rolex Oyster Perpetual Submariner 50th Anniversary Edition
Rolex Oyster Perpetual Submariner 50th Anniversary Edition
$8,495
Seller
WatchUWant.com
46
US
TAG Heuer Carrera Calibre 8
TAG Heuer Carrera Calibre 8
$2,870
Seller
Hyde Park Jewelers
 
US
Breitling Crosswind Special
Breitling Crosswind Special
$12,995
Seller
Watcheslikenew.com
 
US
Rolex Oyster Perpetual Datejust Roman Numbers White Dial Steel...
Rolex Oyster Perpetual Datejust Roman Numbers White Dial Steel...
$4,155
Seller
La Jolla Jewelry and Collateral Loan Company
7
US
Rolex - Daytona Cosmograph : 116523
Rolex - Daytona Cosmograph : 116523
$12,950
Seller
BernardWatch.com
97
US
Rolex Sea-Dweller Deepsea (D-Blue Dial)
Rolex Sea-Dweller Deepsea (D-Blue Dial)
$11,000
Seller
Private seller
US
Rolex GMT-Master II 18K Yellow Gold & S/S 16713
Rolex GMT-Master II 18K Yellow Gold & S/S 16713
$7,499
Seller
Phigora
59
US
Omega Planet Ocean 600 M Co-Axial Chronograph 45.5MM
Omega Planet Ocean 600 M Co-Axial Chronograph 45.5MM
$3,295
Seller
PreOwned Watch Shop
8
US
Panerai PAM00380 Radiomir Black Seal Logo Acciaio 45MM Men...
Panerai PAM00380 Radiomir Black Seal Logo Acciaio 45MM Men...
$3,570
Seller
Watch Warehouse USA
 
US
Omega Seamaster 300M Chronometer
Omega Seamaster 300M Chronometer
$2,495
Seller
WatchUWant.com
46
US
Panerai PAM00448 Radiomir California 3 Days Black Dial (26369)
Panerai PAM00448 Radiomir California 3 Days Black Dial (26369)
$9,700
Seller
European Watch Company
44
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.