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Chrono24 - United States of America

40,381 listings including promoted listings
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Breitling Navitimer
18K Gold Chronograph Automatic
$4,999
Free shipping
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Omega Speedmaster Professional Moonwatch
Unworn
$5,749
Free shipping
Promoted
Rolex Daytona
116509 18K White Gold Black MOP Dial Rolex Service 08/22/2022
$39,000
Free shipping
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Omega Seamaster Planet Ocean
600m America's Cup Limited Edition
$5,679
Free shipping
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Rolex Datejust 41
Rhodium Diamond - Mint - 2022 box and papers
$14,250
+ $85 for shipping
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Rolex Submariner Date
: Submariner Date 41 : 126610LN : Steel : black dial
$13,730
+ $50 for shipping
Popular
Omega Speedmaster Professional Moonwatch
3861 Hesalite 310.30.42.50.01.001
$5,695
+ $50 for shipping
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Omega Speedmaster Professional Moonwatch
Hesalite Cal 3861 310.30.42.50.01.001
$4,895
+ $50 for shipping
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Rolex Datejust 41
Blue Azzuro dial Fluted bezel NEW/UNWORN
$13,200
Free 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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Omega Seamaster Planet Ocean
600M Summer Edition Diver Blue 2023 Bracelet
$7,295
Free shipping
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Omega Seamaster Aqua Terra
220.10.41.21.03.001
$3,650
Excl. shipping
Private Seller
Promoted
Omega Speedmaster Professional Moonwatch
NEW 2024 Speedmaster Moonwatch Co-Axial Master Chronometer 310.30.42.50.01.001
$5,699
Free shipping
Rolex Datejust 41
126334
$13,875
+ $99 for shipping
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Omega Speedmaster Professional Moonwatch
'23 New Speedmaster Hesi Moonwatch Co-Axial Master Chronometer w/New Style Clasp
$5,560
+ $50 for shipping
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Omega Seamaster Diver 300 M
42mm Black 210.30.42.20.01.001
$4,375
+ $50 for shipping
Promoted
Omega Speedmaster Professional Moonwatch
Hesalite NEW 2024 Cal 3861 310.30.42.50.01.001
$5,895
+ $50 for shipping
Rolex Submariner (No Date)
: Submariner : 114060 : Steel : black dial
$10,865
+ $50 for shipping
Promoted
Rolex Datejust 41
NEW 2023 Blue Index Dial Fluted Bezel Oyster Bracelet
$13,995
Free shipping
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Rolex Submariner Date
126610LN EXCELLENT CONDITION WARRANTY B&P
$13,797
Free shipping
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Rolex Datejust 41
Grey Slate Wimbledon Green Roman Dial Oyster Bracelet 126334
$14,500
Free shipping
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Omega Seamaster Diver 300 M
Black Dial Steel Bracelet 210.30.42.20.01.001 Box & Papers 2022
$4,150
Free shipping
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Rolex GMT-Master II
Sprite Left handed date
$18,499
Free shipping
Rolex GMT-Master II
126720VTNR "Sprite" Oyster Stainless Steel 2023
$18,290
+ $75 for shipping
Popular
Omega Speedmaster Professional Moonwatch
3861 Hesalite 310.30.42.50.01.001
$5,950
+ $50 for shipping
Promoted
Tudor Pelagos
25600TB
$3,399
Excl. shipping
Private Seller
Promoted
Rolex Milgauss
Stainless Steel Blue Dial 2021
$13,800
+ $65 for shipping
Promoted
Rolex Datejust 41
NEW 2023 Mint Green Stick Dial Fluted Bezel - Stainless Steel Jubilee Bracelet
$15,995
Free shipping
Popular
Rolex Submariner Date
126610LN Unworn Full Set 2023
$13,980
Free shipping
Promoted
Rolex Datejust 41
Grey Slate Wimbledon Green Roman Dial Oyster Bracelet 126334
$14,580
Free shipping

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Omega Seamaster 300
Limited Edition "Spectre" 233.32.41.21.01.001
$10,000
+ $50 for shipping
Promoted
Rolex GMT-Master II
sprite left handed Jubilee 2024
$19,299
Free shipping
Rolex Submariner Date
126610LN Submariner 41
$15,575
+ $50 for shipping
Popular
Omega Seamaster 300
Heritage 41mm Black Dial 234.30.41.21.01.001
$5,295
+ $50 for shipping
Promoted
Omega Seamaster Diver 300 M
210.30.42.20.03.001
$3,980
Excl. shipping
Private Seller
Rolex Submariner (No Date)
2024 NEW 124060 Stainless Steel
$13,245
+ $99 for shipping
Promoted
Rolex Submariner Date
MINT Condition Black Dial Black Bezel Stainless Steel Complete Box Set
$13,995
Free shipping
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Breitling Navitimer 1 B01 Chronograph
Box/Papers
$5,250
+ $50 for shipping
Promoted
Rolex Datejust 41
Grey Slate Wimbledon Green Roman Dial Oyster Bracelet 126334
$14,650
Free shipping
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Rolex Submariner Date
Ceramic 41mm Black Dial 126610LN Box & Papers 2022
$13,650
Free shipping
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Rolex Submariner Date
41mm NEW/UNWORN
$14,390
Free shipping
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Rolex Datejust 41
41mm Unworn 2024 Blue Oyster 126334-0001
$13,975
Free shipping
Rolex Submariner Date
16613LN Submariner 18K/SS
$11,675
+ $50 for shipping
Rolex Submariner (No Date)
2023+ NEW Submariner 41mm 124060 Stainless Steel Black Dial No Date Complete Set
$12,825
Free shipping
Breitling
Navitimer 01 B01 Chronograph 43mm Grey LIMITED Steel AB012124/F569 Bracelet
$5,499
+ $64 for shipping
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Rolex Submariner (No Date)
NEW 2023 124060 No Date Black Dial Ceramic Bezel - Complete Set
$12,795
Free shipping
Rolex Sea-Dweller
50th Anniversary Red Letters Unworn
$14,199
Free shipping
Promoted
Rolex Submariner (No Date)
Black Dial No Date 124060
$13,600
Free shipping
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Rolex Datejust 41
126334 Grey Dial Fluted Bezel Jubilee Stainless Steel
$14,099
+ $75 for shipping
Promoted
Rolex Submariner (No Date)
41mm No Date
$12,849
Free shipping
Promoted
Rolex Datejust 41
Mint Green Baton Dial Steel And White Gold 126334 Box And Papers 2024
$15,658
+ $131 for shipping
Rolex GMT-Master II
126720VTNR GMT Master II on Jubilee
$19,575
+ $50 for shipping
Rolex Submariner Date
Ceramic 41mm Black Dial 126610LN Box & Papers 2020
$13,395
Free shipping
Popular
Omega Seamaster 300
Master Retro 41mm 233.30.41.21.01.001 Bracelet
$3,899
+ $64 for shipping
Rolex Submariner (No Date)
No-Date 124060 - Unworn 2023
$13,495
Free shipping
Promoted
Omega Speedmaster Racing
Silver Dial
$3,056
+ $29 for shipping
Tudor Black Bay Chrono
41mm White 79360N
$4,495
+ $50 for shipping
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Omega Seamaster Aqua Terra
2503.33.00
$2,700
Excl. shipping
Private Seller
Rolex GMT-Master II
Sprite Unworn
$17,699
Free shipping
Promoted
Rolex GMT-Master II
NEW 2024 GMT-Master II "Sprite" Oyster 126720VTNR
$18,600
+ $49 for shipping
Rolex Submariner (No Date)
124060 Submariner 41 No Date
$14,575
+ $50 for shipping
Popular
Omega Speedmaster Professional Moonwatch
Hesalite NEW 2023 - Cal 3861 310.32.42.50.01.001
$5,545
+ $50 for shipping
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Omega Speedmaster Racing
Box/Papers
$6,600
+ $50 for shipping

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.


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