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Longines Record L23204966 New Steel 26.00mm Automatic United States of America, California, San Mateo
Promoted
Longines Record
L23204966 - Record Automatic Ladies Watch
$1,335
Free shipping
Rolex Datejust 41 126334 New Steel 41mm Automatic United States of America, New York, New York City
Promoted
Rolex Datejust 41
126334 Black Stick Dial - Oyster Bracelet - Unworn 2022
$12,595
Free shipping
Rolex Day-Date 36 18238 Very good Yellow gold 36mm Automatic United States of America, California, Chino Hills
Promoted
Rolex Day-Date 36
Mens Daydate Champagne Factory Diamond 18k Yellow Gold President Watch
$20,490
Free shipping
Rolex GMT-Master II 126720VTNR New Steel 40mm Automatic United States of America, Pennsylvania, Moosic
Promoted
Rolex GMT-Master II
NEW 2022 GMT-Master II #34;Sprite" Jubilee
$26,500
Free shipping
Rolex Datejust 41 126334 New Steel 41mm Automatic United States of America, Massachusetts, Boston
Promoted
Rolex Datejust 41
126334 NEW 2022 NOVEMBER Dark Rhodium Oyster Steel 41 mm
$12,985
Free shipping
Rolex Datejust 41 126334 New White gold 41mm Automatic United States of America, New York, New York
Promoted
Rolex Datejust 41
18k White Gold amp; Steel Black Diamond Dial Jubilee (126334)
$15,500
Free shipping
Rolex Day-Date 36 118139 Very good White gold 36mm Automatic United States of America, New York, Massapequa
Rolex Day-Date 36
118139 White Gold Blue Dial
$21,000
+ $75 for shipping
Rolex Day-Date 36 18348 Good Yellow gold 36mm Automatic United States of America, California, Newport Beach
Promoted
Rolex Day-Date 36
Factory Black Diamond Dial Bezel Box amp; Papers
$22,795
Free shipping
Omega Speedmaster Professional Moonwatch 310.30.42.50.01.001 New Steel 42mm Manual winding United States of America, New Jersey, Oradell
Promoted
Omega Speedmaster Professional Moonwatch
3861 Hesalite 310.30.42.50.01.001
$5,595
+ $50 for shipping
Rolex Datejust 41 126334 Unworn Steel 41mm Automatic United States of America, Pennsylvania, HARRISBURG
Promoted
Rolex Datejust 41
2019 Datejust 41 Boxes Papers Slate Roman Wimbledon Dial Jubilee Bracelet 126334
$15,897
Free shipping
Rolex Datejust 41 126334 Unworn White gold 41mm Automatic United States of America, Florida, Fort Lauderdale
Promoted
Rolex Datejust 41
2022 Datejust 41 #39;Mint Green Index' Dial 126334 Oyster Bracelet #39;In Stock'
$15,295
+ $50 for shipping
Omega Speedmaster Professional Moonwatch 310.20.42.50.01.001 New Steel 42mm Manual winding United States of America, Florida, Holly Hill
Promoted
Omega Speedmaster Professional Moonwatch
BNIB Speedmaster Professional Moonwatch 50th Anniversary
$15,900
Free shipping
Rolex Datejust 41 126334 New Steel 41mm Automatic United States of America, Pennsylvania, Moosic
Promoted
Rolex Datejust 41
NEW 2022 Datejust 41 MINT GREEN 126334
$15,600
Free shipping
Rolex Submariner Date 126610LN New Steel 41mm Automatic United States of America, Massachusetts, Boston
Promoted
Rolex Submariner Date
126610LN NEW 2022 DECEMBER Black 41 mm
$14,785
Free shipping
Rolex Datejust 41 126334 New Steel 41mm Automatic United States of America, New York, New York
Promoted
Rolex Datejust 41
Oyster 41 mm Oystersteel Mint Green Dial Fluted Bezel Oyster Bracelet Ref 126334
$17,000
Free shipping
Rolex Submariner Date 126610LN New Steel 41mm Automatic United States of America, New York, Massapequa
Rolex Submariner Date
41MM
$15,200
+ $75 for shipping
Rolex Daytona 116505 New Rose gold 40mm Automatic United States of America, Illinois, Springfield
Promoted
Rolex Daytona
Rose Gold Chocolate Dial New Nov 2022
$54,100
+ $65 for shipping
Rolex Lady-Datejust 69173 Very good Steel 26mm Automatic United States of America, California, Chino Hills
Promoted
Rolex Lady-Datejust
Ladies Datejust 69173 Champagne Jubilee Diamond Dial 18k Gold Steel Watch
$5,395
Free shipping
Omega Seamaster Planet Ocean 232.30.42.21.01.001 Very good Steel 42mm Automatic United States of America, Pennsylvania, HARRISBURG
Promoted
Omega Seamaster Planet Ocean
2014 Seamaster Planet Ocean Untouched Boxes Papers Co-Axial 42mm Stainless 232.30.42
$5,872
Free shipping
Rolex Submariner Date 126610LN Unworn Steel 41mm Automatic United States of America, Florida, Miami
Promoted
Rolex Submariner Date
2022 Submariner Date 41mm “Black Dial” 126610LN Stainless Steel Unworn In Stock
$15,595
+ $50 for shipping
Omega Constellation 2852 Very good Gold/Steel 35mm Automatic United States of America, Massachusetts, West Boylston
Omega Constellation
Ref. 2852 Two-Tone Case amp; Bracelet. Early 60s. EXCELLENT CONDITION
$2,395
+ $49 for shipping
Rolex Datejust 41 126334 New Steel 41mm Automatic United States of America, Pennsylvania, Moosic
Promoted
Rolex Datejust 41
NEW 2022 GREEN Datejust 41 JUBILEE 126334
$15,999
Free shipping
Rolex Explorer II 226570 New Steel 42mm Automatic United States of America, Massachusetts, Boston
Promoted
Rolex Explorer II
226570 NEW 2022 NOVEMBER White Polar Oyster Steel 42 mm
$13,100
Free shipping
Rolex Datejust 41 126334 New Steel 41mm Automatic United States of America, New York, New York
Promoted
Rolex Datejust 41
18k White Gold and Steel Blue Index Dial Jubilee 126334
$15,250
Free shipping
Rolex Datejust 41 126334 New Steel 41mm Automatic United States of America, New York, Massapequa
Rolex Datejust 41
2022 Datejust 41mm 126334 Fluted Bezel Blue Diamond Dial Jubilee Stainless Steel Bracelet
$15,800
+ $75 for shipping
Rolex Daytona 116500LN Unworn Steel 40mm Automatic United States of America, Illinois, Springfield
Promoted
Rolex Daytona
Stainless Steel White 2021 Full Set
$30,000
+ $65 for shipping
Rolex Lady-Datejust 69178 Very good Yellow gold 26mm Automatic United States of America, California, Chino Hills
Promoted
Rolex Lady-Datejust
Ladies President 69178 Factory Ruby String Diamond 18k Yellow Gold Watch
$12,190
Free shipping
Rolex Sea-Dweller 126600 Unworn Steel 43mm Automatic United States of America, California, Los Angeles
Promoted
Rolex Sea-Dweller
126600
$14,500
+ $29 for shipping
Rolex GMT-Master II 126720VTNR Unworn Steel 40mm Automatic United States of America, Florida, Fort Lauderdale
Promoted
Rolex GMT-Master II
2022 GMT-Master II 126720VTR “Sprite” SS Jubilee Bracelet Unworn In-Stock
$28,875
+ $50 for shipping
Tudor Black Bay Fifty-Eight M79010SG-0002 Unworn Silver 39mm Automatic United States of America, Massachusetts, West Boylston
Tudor Black Bay Fifty-Eight
925. Unworn with Card from 5/2021
$3,995
+ $49 for shipping

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Rolex Datejust 41 126334 New Steel 41mm Automatic United States of America, Pennsylvania, Moosic
Promoted
Rolex Datejust 41
NEW 2022 Datejust 41 WIMBELDON JUBILEE
$15,400
Free shipping
Rolex Datejust 41 126334 New Steel 41mm Automatic United States of America, Massachusetts, Boston
Promoted
Rolex Datejust 41
126334 NEW 2022 NOVEMBER Wimbledon Slate Roman Oyster Steel 41 mm
$13,885
Free shipping
Rolex Datejust 41 126334-0005 New Gold/Steel 41mm Automatic United States of America, New York, New York
Promoted
Rolex Datejust 41
18k White Gold amp; Steel Dark Rhodium Diamond Dial Oyster 126334
$15,500
Free shipping
Rolex Day-Date 36 118135 Very good Rose gold 36mm Automatic United States of America, New York, Massapequa
Rolex Day-Date 36
Rose Gold Chocolate Dial Day-Date 36
$24,500
+ $75 for shipping
Rolex Milgauss 116400GV New Steel 40mm Automatic United States of America, Illinois, Springfield
Promoted
Rolex Milgauss
Stainless Steel Black Dial 2022 BNIB
$11,200
+ $65 for shipping
Rolex Oyster Perpetual 41 124300 Very good Steel 41mm Automatic United States of America, California, Chino Hills
Promoted
Rolex Oyster Perpetual 41
2022 Rolex Oyster Perpetual 124300 41mm Blue Dial Stainless Steel Watch W Card
$9,200
Free shipping
Rolex Sky-Dweller 326934 Very good Steel 42mm Automatic United States of America, Texas, Dallas
Promoted
Rolex Sky-Dweller
326934
$28,800
+ $29 for shipping
Rolex Datejust 41 126334 Unworn Steel 41mm Automatic United States of America, Florida, Miami
Promoted
Rolex Datejust 41
2022 Datejust 41mm “Blue Diamond Dial” 126334 Jubilee Bracelet Unworn “In Stock”
$16,595
+ $50 for shipping
Omega De Ville Hour Vision 431.30.41.22.02.001 Good Steel 41mm Automatic United States of America, Florida, Sarasota
Promoted
Omega De Ville Hour Vision
Annual Calendar 41mm Men's Watch 431.30.41.22.02.001
$4,950
Free shipping
Rolex Datejust 41 126334 New Steel 41mm Automatic United States of America, Pennsylvania, Moosic
Promoted
Rolex Datejust 41
NEW 2022 Datejust 41 BLACK DIAL JUBILEE
$13,999
Free shipping
Breitling Avenger II Seawolf A1733110/I519/169A Very good Steel 45mm Automatic United States of America, Massachusetts, West Boylston
Breitling Avenger II Seawolf
Automatic Watch A17331 Box YELLOW Dial BRACELET
$3,495
+ $49 for shipping
Rolex Datejust 41 126334 New Steel 41mm Automatic United States of America, New York, New York
Promoted
Rolex Datejust 41
Stainless Steel amp; White Gold Silver Index Dial Jubilee 126334
$14,500
Free shipping
Rolex Sea-Dweller 126600 New Steel 43mm Automatic United States of America, Florida, Hallandale
Rolex Sea-Dweller
#34;SINGLE RED" Sea-Dweller
$15,099
Free shipping
Rolex GMT-Master II 116710BLNR Very good Steel 40mm Automatic United States of America, Illinois, Springfield
Promoted
Rolex GMT-Master II
Batman 116710BLNR Full Set
$15,500
+ $65 for shipping
Rolex Datejust 36 16234 Very good Steel 36mm Automatic United States of America, California, Chino Hills
Promoted
Rolex Datejust 36
Mens Rolex Datejust 16234 Factory Diamond Dial 18k White Gold amp; Steel Watch
$7,499
Free shipping
Rolex Datejust 41 126334 New Gold/Steel 41mm Automatic United States of America, Florida, Miami
Rolex Datejust 41
New Unworn November 2022 Green Motif Dial Jubilee Datejust 41 126334
$15,999
+ $499 for shipping
Rolex Datejust 41 126334 Very good White gold 41mm Automatic United States of America, Florida, Fort Lauderdale
Promoted
Rolex Datejust 41
2021 Datejust 41 #39;Black Diamond Dial' 126334 Jubilee Bracelet #34;In Stock"
$13,995
+ $50 for shipping
Ulysse Nardin Marine Chronometer 41mm 263-66-3/625 Good Steel 41mm Automatic United States of America, Florida, Sarasota
Promoted
Ulysse Nardin Marine Chronometer 41mm
Maxi Marine Brown Dial 41mm Automatic Men's Watch 263-66-3/625
$3,950
Free shipping
Rolex Submariner Date 126610LN New Steel 41mm Automatic United States of America, Pennsylvania, Moosic
Promoted
Rolex Submariner Date
NEW 2022 Submariner Date 41mm IN STOCK
$14,799
Free shipping
Rolex GMT-Master II 126720VTNR Unworn Steel 40mm Automatic United States of America, Florida, Doral
Rolex GMT-Master II
126720VTNR GMT-Master II Sprite Left Handed Jubilee
$23,489
Free shipping
Rolex Datejust 41 126334 New Steel 41mm Automatic United States of America, New York, New York
Promoted
Rolex Datejust 41
18k White Gold and Steel Blue Index Dial Oyster 126334
$14,800
Free shipping
Rolex Cellini Dual Time 50529 New White gold 39mm Automatic United States of America, Georgia, Alpharetta
Rolex Cellini Dual Time
NEW 2022 Cellini Dual Time 50529-0006
$16,750
Free shipping
Rolex Datejust 36 126283RBR Very good Gold/Steel 36mm Automatic United States of America, Illinois, Springfield
Promoted
Rolex Datejust 36
MOP Diamond Dial and Diamond Bezel
$24,500
+ $65 for shipping
Rolex Datejust 36 16234 Very good Steel 36mm Automatic United States of America, California, Chino Hills
Promoted
Rolex Datejust 36
Mens Datejust 16234 Black Dial 18k White Gold Stainless Steel Watch
$6,799
Free shipping
Rolex Datejust 41 126334 New White gold 41mm Automatic United States of America, Florida, Miami
Rolex Datejust 41
2022 New Unworn Blue Motif Dial Jubilee Bracelet Fluted Steel Datejust 41
$15,495
+ $499 for shipping
Omega Seamaster Diver 300 M 210.30.42.20.03.001 Unworn Steel 42mm Automatic United States of America, Florida, Fort Lauderdale
Promoted
Omega Seamaster Diver 300 M
Grey Dial In-Stock
$4,995
+ $50 for shipping
Rolex Datejust 41 126334 Very good Steel 41mm Automatic United States of America, New York, New York
Rolex Datejust 41
Blue Dial Full Set In Stock
$11,900
Free shipping
Rolex GMT-Master II 126720VTNR New Steel 40mm Automatic United States of America, Pennsylvania, Moosic
Promoted
Rolex GMT-Master II
NEW 2022 GMT-Master II #34;Sprite" Oyster
$25,999
Free shipping
Paul Picot Atelier 4035 Unworn Steel 35mm Automatic United States of America, Florida, Sarasota
Promoted
Paul Picot Atelier
Classic Power Reserve Chronometer Automatic 35mm Watch 4035
$2,450
Free shipping
Rolex Datejust 41 126334 New Steel 41mm Automatic United States of America, New York, New York
Promoted
Rolex Datejust 41
Stainless Steel amp; White Gold - Black Index Dial - Fluted Bezel 126334
$14,000
Free shipping
Omega Speedmaster Professional Moonwatch 310.30.42.50.01.001 New Steel 42mm Manual winding United States of America, Georgia, Alpharetta
Omega Speedmaster Professional Moonwatch
NEW 2022 Speedmaster Moonwatch Co-Axial Master Chronometer 310.30.42.50.01.001
$5,299
Free shipping
Rolex Daytona 116500LN New Steel 40mm Automatic United States of America, Illinois, Springfield
Promoted
Rolex Daytona
Stainless Steel Black Dial Nov 2022 BNIB
$27,900
+ $65 for shipping
Rolex GMT-Master II 116710BLNR Very good Steel 40mm Automatic United States of America, California, Chino Hills
Promoted
Rolex GMT-Master II
2017 Rolex Gmt Master II 116710 Blnr 40mm Batman Blue Black Ceramic Watch + Card
$17,550
Free shipping

Performance of a Similar Model

Rolex Datejust 41
126334 ()
Case material
Steel
Dial
Grey







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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.