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Rolex Submariner Date 126610LV New Steel 41mm Automatic United States of America, Massachusetts, Boston
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Rolex Submariner Date 126610LV NEW Stickers Sept 2021 Steel 41 mm
$21,150
+ $100 for shipping
Professional dealer
4.82 (116)
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Rolex Submariner (No Date) 5508 Good Steel 37mm Automatic United States of America, North Carolina, McLeansville
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Rolex Submariner 1959 James Bond
$24,999
+ $19 for shipping
Professional dealer
5.00 (3)
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Rolex Submariner (No Date) 124060 Very good Steel 41mm Automatic United States of America, New Jersey, Princeton
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Rolex Submariner No-Date 124060 Holiday Steal
$13,600
Free shipping
Professional dealer
4.94 (583)
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Rolex Submariner Date 126610LN New Steel 41mm Automatic United States of America, Massachusetts, Quincy
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Rolex 126610LN Submariner Date 41mm NEW 2021
$16,625
+ $75 for shipping
Professional dealer
5.00 (7)
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Rolex Day-Date 40 228235-0025 New Rose gold 40mm Automatic United States of America, New York, NEW YORK
Rolex Rose Gold Day Date 40 Olive Roman Dial 228235
$74,990
Free shipping
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US
Rolex Datejust 41 126334 Very good Steel 41mm Automatic United States of America, California, Los Angeles
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Rolex Datejust 41 Rhodium Diamond Fluted Oyster Box/Papers/Car...
$13,499
Free shipping
Professional dealer
4.97 (194)
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Rolex Datejust 41 126334 Very good Steel 41mm Automatic United States of America, Florida, Coral Gables
Rolex Datejust - Silver Stick Dial - 126334 Jubilee Bracelet
$11,989
+ $69 for shipping
Professional dealer
4.98 (106)
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Rolex Datejust 41 126334 Very good Steel 41mm Automatic United States of America, New York, New York
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Rolex Datejust 41 Stainless Steel and White Gold Silver Index...
$12,799
Free shipping
Professional dealer
4.94 (266)
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Rolex Datejust 41 126334 New Steel 41mm Automatic United States of America, Pennsylvania, HARRISBURG
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Rolex Datejust 41 Wimbledon Slate Dial Fluted Bezel Jubilee...
$16,939
Free shipping
Professional dealer
4.94 (125)
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Tudor Black Bay Fifty-Eight M79010SG-0002 Very good Silver 39mm Automatic United States of America, Florida, Hollywood
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Tudor Black Bay Fifty-Eight 925 M79010SG Silver Complete
$5,150
+ $29 for shipping
Professional dealer
4.97 (40)
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Rolex Submariner Date 1680 Good Steel 40mm Automatic United States of America, Texas, Austin
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Rolex : 'Red' Submariner Date 1680 : 1680 : :
$31,270
+ $40 for shipping
Professional dealer
4.92 (540)
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Rolex Datejust 41 126334 New Steel 41mm Automatic United States of America, New York, NEW YORK
Rolex 126334 Datejust 41mm White Gold Diamond Black Dial...
$14,750
Free shipping
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Omega Seamaster Aqua Terra 220.10.43.22.03.001 Very good Steel 43mm Automatic United States of America, California, Los Angeles
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Omega Seamaster Aqua Terra 150M Blue GMT Worldtimer Box/Papers...
$7,999
Free shipping
Professional dealer
4.97 (194)
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Omega Constellation OT 2799 Very good Yellow gold 35mm Automatic United States of America, Massachusetts, Boston
Omega Constellation Pie Pan De Luxe OT 2799 Cal. 354 Bumper...
$5,200
+ $100 for shipping
Professional dealer
4.82 (116)
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Rolex Submariner (No Date) 124060 Very good Steel 41mm Automatic United States of America, Florida, Coral Gables
Rolex Submariner 124060 - Full Set
$14,599
+ $69 for shipping
Professional dealer
4.98 (106)
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Rolex Submariner Date 126610LN Very good Steel 41mm Automatic United States of America, New Jersey, Totowa
Rolex Submariner Date 41mm 126610LN 2020
$15,999
+ $79 for shipping
Professional dealer
4.98 (354)
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Rolex GMT-Master II 16710 Unworn Steel 40mm Automatic United States of America, Pennsylvania, HARRISBURG
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Rolex GMT-Master II 2001 Boxes Papers Pepsi Blue Red Bezel...
$19,471
Free shipping
Professional dealer
4.94 (125)
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Chopard L.U.C 168561-3001 New Steel 43mm Automatic United States of America, Florida, Miami
Chopard L.U.C Perpetual Twin
$18,000
+ $35 for shipping
Professional dealer
4.94 (198)
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Patek Philippe Minute Repeater Perpetual Calendar 5207G-001 New White gold 41mm Manual winding United States of America, Massachusetts, Boston
Patek Philippe 5207G Minute Repeater Tourbillon Blue Dial UNWORN
$999,500
+ $29 for shipping
Professional dealer
4.88 (627)
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Rolex Sky-Dweller 326934 Unworn Steel 42mm Automatic United States of America, Texas, Austin
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Rolex : Sky-Dweller : 326934 : Stainless Steel : blue dial
$31,150
+ $40 for shipping
Professional dealer
4.92 (540)
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Rolex Datejust 41 126334 New Steel 41mm Automatic United States of America, New York, New York
Rolex Datejust 41 Stainless Steel Blue Dial Oyster Bracelet...
$14,399
Free shipping
Professional dealer
4.94 (118)
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Tudor Black Bay Fifty-Eight M79010SG-0002 New Silver 39mm Automatic United States of America, California, Los Angeles
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Tudor Black Bay Fifty-Eight 925 Silver Fabric Box/Papers/Card...
$5,199
Free shipping
Professional dealer
4.97 (194)
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Rolex Milgauss 116400 Very good Steel 40mm Automatic United States of America, Massachusetts, Boston
Rolex Milgauss 116400 White 2009 Box Papers Steel 40 mm
$11,500
+ $100 for shipping
Professional dealer
4.82 (116)
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Rolex Datejust 41 126334 Unworn Steel 41mm Automatic United States of America, Florida, Coral Gables
Rolex Datejust 126334 White Dial - Full Set
$12,999
+ $69 for shipping
Professional dealer
4.98 (106)
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Rolex Datejust 41 126334 New Steel 41mm Automatic United States of America, New Jersey, Totowa
Rolex Datejust 41mm 126334 Blue Roman Jubilee 2021
$14,499
+ $79 for shipping
Professional dealer
4.98 (354)
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Rolex Submariner Date 126610LN New Steel 41mm Automatic United States of America, New York, NEW YORK
Rolex Submariner Date 41mm 126610LN Unworn Complete set 2021
$16,250
Free shipping
Professional dealer
US
Rolex Datejust 41 126334 New Steel 41mm Automatic United States of America, New Jersey, Woodbridge
Rolex Datejust 41mm 126334 Black Diamond Dial Oyster Stainles...
$15,499
Free shipping
Professional dealer
4.93 (10)
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Rolex Day-Date 40 228238 Yellow gold 40mm Automatic United States of America, Massachusetts, Boston
Rolex Day Date 228238 Presidential 18k Yellow Gold with Silver...
$46,900
+ $29 for shipping
Professional dealer
4.88 (627)
US
Rolex Sky-Dweller 326934 Very good Gold/Steel 42mm Automatic United States of America, New York, Smithtown
Rolex MINT 2019 Rolex Sky-Dweller Stainless Oyster Blue 18K...
$29,994
Free shipping
Professional dealer
4.92 (366)
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Rolex Datejust 41 126334 Very good Steel 41mm Automatic United States of America, New York, New York
Rolex Datejust 41 White Gold/Stainless Steel Mother Of Pearl...
$16,800
Free shipping
Professional dealer
4.94 (118)
US

Worry-Free Watch Purchases

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Omega Speedmaster Professional Moonwatch 310.30.42.50.01.001 New Steel 42mm Manual winding United States of America, California, Los Angeles
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Omega 2021 Speedmaster Moonwatch Hesalite Co-Axial 3861...
$5,999
Free shipping
Professional dealer
4.97 (194)
US
Omega De Ville Prestige 4861.31.32 Good Steel 35mm Automatic United States of America, Massachusetts, Boston
Omega DeVille Prestige Co-Axial 4861.31.32 Cal. 2500 Automatic...
$2,750
+ $65 for shipping
Professional dealer
4.82 (116)
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.