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Rolex Datejust 41
41mm Wimbledon Jubilee NEW/UNWORN
$15,149
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Rolex Datejust 41
41mm Fluted Mint Green Dial Oyster 126334 Unworn 2024
$14,665
+ $100 for shipping
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Rolex Datejust 41
NEW Datejust 41mm 126334 Fluted Bezel Rhodium Diamond Dial Oyster Bracelet Stainless
$14,425
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Rolex Datejust 41
Rhodium Diamond dial Mint - 2022 box and papers
$13,950
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Rolex Datejust 41
126334
$11,200
+ $99 for shipping
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Rolex Submariner Date
126610LN New Full Set
$13,975
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Rolex Datejust 41
126334 Blue Index Oyster Fluted Bezel 2018 Pre-owned
$11,695
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Omega Speedmaster Professional Moonwatch
New 2023 Speedmaster Professional Moonwatch / Warranty
$5,088
+ $57 for shipping
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Rolex Datejust 41
In Stock Datejust 41 Blue Roman Dial 126334 Jubilee Bracelet
$13,095
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Omega Speedmaster Professional Moonwatch
Full Set 2021 Hesalite
$5,495
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Omega Speedmaster Reduced
Chronograph 39mm Black Dial 3510.50
$4,629
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Tudor Pelagos
Titanium Dive Watch (Black) 42mm
$3,299
Excl. shipping
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Rolex Datejust 41
Grey Slate Wimbledon Green Roman Dial Oyster Bracelet 126334
$14,500
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Rolex Submariner Date
Ceramic 41mm Black Dial 126610LN Box & Papers 2022
$13,875
+ $100 for shipping
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Rolex GMT-Master II
126720VTNR Unworn Full Set Jubilee Sprite
$18,675
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Rolex Submariner (No Date)
41mm Black Dial 124060
$12,395
+ $50 for shipping
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Tudor Black Bay Fifty-Eight
925 Silver 39mm (M79010SG-0001) - BOX & PAPERS 2021
$3,450
+ $50 for shipping
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Rolex Datejust 41
In Stock 2023 Datejust 41 Wimbledon Dial 126334 Jubilee Bracelet
$15,995
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Rolex Datejust 41
Mint Green dial NEW/UNWORN
$15,349
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Omega Seamaster Planet Ocean
600M Summer Edition Diver Blue 2023 Bracelet
$6,995
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Rolex Datejust 41
126334 Wimbeldon Dial Oyster
$11,999
+ $99 for shipping
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Rolex Datejust 41
Grey Slate Wimbledon Green Roman Dial Oyster Bracelet 126334
$14,650
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Rolex Submariner (No Date)
Ceramic 41mm Black Dial 124060 Box & Papers 2022
$11,999
+ $100 for shipping
Rolex Submariner Date
41mm 126610LN Stainless Steel 2023
$14,445
+ $75 for shipping
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Rolex Datejust 41
Mint Green Jubilee 126334
$13,950
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Omega Seamaster PloProf
Certified
White 1200m 55mm Automatic Steel 224.32.55.21.04.001 Rubber
$6,349
+ $64 for shipping
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Rolex Submariner Date
In Stock 2024 Submariner Date Black Dial 126610LN Oyster Bracelet
$15,595
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Citizen
Bullhead AN3660-81A Chronograph
$240
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Rolex Datejust 41
2021 Datejust 41mm 126334 Stainless Steel Oyster Rhodium Diamond Dial
$12,455
+ $100 for shipping
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Rolex Submariner (No Date)
41mm No Date
$12,549
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Rolex Datejust 41
Grey Slate Wimbledon Green Roman Dial Oyster Bracelet 126334
$14,580
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Rolex Datejust 41
Certified
41mm Grey Diamond Jubilee 126334-0006 Mint 2020
$13,950
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Omega Speedmaster Professional Moonwatch
Certified
310.30.42.50.01.001
$5,418
Excl. shipping
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Rolex GMT-Master II
126720VTNR "Sprite" Oyster Stainless Steel 2023
$18,495
+ $75 for shipping
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Omega Seamaster Aqua Terra
Blue
$4,195
+ $55 for shipping
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Rolex Datejust 41
In Stock 2023 Datejust 41 Blue Roman Dial 126334 Oyster Bracelet
$12,195
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Omega Speedmaster Racing
Certified
40mm Steel Grey Yellow 326.30.40.50.06.001 Bracelet
$3,199
+ $64 for shipping
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Omega Seamaster Diver 300 M
42mm Stainless Steel Bracelet 210.30.42.20.01.001 Box & Papers
$4,350
+ $50 for shipping
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Rolex Datejust 41
Blue Azzuro dial Fluted bezel NEW/UNWORN
$13,090
Free shipping
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Rolex GMT-Master II
Sprite Unworn
$17,439
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Rolex Submariner (No Date)
Oyster Black Dial Ceramic Watch 41mm 124060 2022
$12,790
+ $69 for shipping
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Omega Speedmaster Professional Moonwatch
Hesalite Chronograph
$5,750
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Omega Seamaster Planet Ocean
600M Blue Dial Steel Ceramic 43.5mm – 215.30.44.21.03.001
$4,975
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Tudor Black Bay Fifty-Eight
M79030N-0001
$3,000
Excl. shipping
Private Seller
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Omega Seamaster Diver 300 M
210.30.42.20.03.001
$4,345
+ $55 for shipping
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Omega Speedmaster Professional Moonwatch
Co-Axial Hesalite
$5,699
+ $49 for shipping
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Omega Speedmaster Professional Moonwatch
310.30.42.50.01.001
$6,399
+ $99 for shipping
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Rolex Submariner Date
41mm NEW/UNWORN
$14,190
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Breitling Chronomat GMT
40
$3,997
Excl. shipping
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Rolex Datejust 41
126334 Azzurro Blue Roman Dial Fluted Bezel - Oyster Bracelet - 2021 Complete
$12,495
Free shipping
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Rolex Submariner Date
NEW 2024 Submariner Date 126610LN IN STOCK
$14,475
+ $49 for shipping
Rolex Datejust 41
Certified
126334 Datejust 41 with Slate Stick Dial on Oyster
$13,475
+ $50 for shipping
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Rolex GMT-Master II
In Stock 2024 GMT-Master II Sprite 126720VTNR Jubilee Bracelet
$20,995
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Tudor Black Bay Chrono
Certified
Chronograph Black Dial 41mm 79360 Leather MT5813 79360N (2023)
$3,749
+ $64 for shipping
Rolex Sea-Dweller
red letter - 2020 - 43mm - Excellent condition - box and papers
$12,250
+ $85 for shipping
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Tudor Black Bay 36
M79640-0002
$3,111
Excl. shipping
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Rolex Sea-Dweller
43mm Black Dial 126600
$12,950
+ $50 for shipping
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Omega Seamaster Aqua Terra
Co-axial
$3,280
+ $39 for shipping
Rolex GMT-Master II
Sprite Unworn
$17,699
Free shipping
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Rolex GMT-Master II
NEW 2024 GMT-Master II "Sprite" Oyster 126720VTNR
$18,600
+ $49 for shipping
Rolex Submariner Date
Certified
126610LN Submariner 41
$14,675
+ $50 for shipping
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Rolex Submariner (No Date)
124060
$11,899
+ $49 for shipping
Rolex Submariner Date
126610LN
$13,949
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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.