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41 038 listings including promoted listings
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Promoted
Rolex Day-Date 36
Certified
Rare Day-Date Turquoise Stella Dial 18039
123 306
Free shipping
Promoted
Rolex Daytona
Certified
Zenith Daytona Inverted 6 16518
36 214
Free shipping
Promoted
Omega Seamaster Aqua Terra
FULL SET - Seamaster Aqua Terra 231.13.42.21.02.001
4 727
+ €39 for shipping
Omega Seamaster Planet Ocean
2200.51.00
3 300
Free shipping
Popular
Omega Seamaster Diver 300 M
Certified
2220.80.00
3 240
Excl. shipping
Private Seller
Breitling Superocean 44
Special Black 2017 FULLSET Serviced 2020 Breitling
2 950
+ €10 for shipping
Popular
Omega Constellation
Piepan
1 000
Free shipping
Promoted
Omega Seamaster Diver 300 M
212.30.41.20.03.001
3 300
+ €49 for shipping
Chrono24 Direct
Promoted
Rolex Datejust 41
Certified
Ref. 126334 Rhodium Diamond Dial Excellent Conditions Full Set 2021
14 500
+ €199 for shipping
Popular
Omega Seamaster Railmaster
Certified
220.10.38.20.01.002
4 590
Excl. shipping
Private Seller
Rolex Submariner (No Date)
Certified
Random Serial NOS UNWORN full STICKERS
16 200
+ €9 for shipping
Omega Speedmaster
White Side of the Moon Ceramic
9 290
+ €100 for shipping
Omega Seamaster Diver 300 M
Chronograph
3 850
Free shipping
Popular
Rolex Submariner (No Date)
01/2023 - LC100 - Neu / Ungetragen - Fullset
12 500
+ €45 for shipping
Omega
f300 Electronic Genéve Chronometer
630
Excl. shipping
Private Seller
Popular
Omega Speedmaster
Moonphase Moonwatch 44mm Blue 2019 FULLSET
7 495
+ €10 for shipping
Popular
Omega Speedmaster
Dark Side Of The Moon
8 140
+ €25 for shipping
Popular
Rolex Submariner (No Date)
Certified
2023 Unworn
12 900
+ €200 for shipping
Tudor Black Bay GMT
Certified
M79830RB-0001
3 563
Excl. shipping
Private Seller
Promoted
Omega Seamaster Aqua Terra
Certified
Stahl Automatik Herrenuhr Ref 2503.34.00
2 750
+ €49 for shipping
Rolex Submariner Date
Certified
Random Serial NOS UNOWRN full STICKERS
15 200
+ €9 for shipping
Popular
Rolex Datejust 41
126334 'Mint Green' - 2023 Box & Papers
14 007
+ €83 for shipping
Popular
Rolex Submariner (No Date)
Certified
12/2020 - LC100 - Wie Neu - Fullset inkl. Erstkaufrechnung
11 500
+ €45 for shipping
Promoted
Omega Seamaster
Certified
Professional Mid Size box&papers ref: 2551.80 - Newly serviced
2 690
Free shipping
Promoted
Rolex GMT-Master II
2023 GMT-Master II Sprite Left Hander Unworn Box Papers 126720VTNR
20 292
+ €119 for shipping
Rolex Submariner (No Date)
124060 12/2023
12 440
+ €150 for shipping
Popular
Rolex GMT-Master II
New 2023
18 390
+ €369 for shipping
Popular
Rolex Datejust 41
Slate Dial 126334
10 829
+ €309 for shipping
Promoted
Omega Seamaster Planet Ocean
Certified
Automatik Ref. 215.33.44.21.03.001
4 250
+ €49 for shipping
Rolex Datejust 41
complete set
12 250
+ €59 for shipping

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Popular
Omega Speedmaster Professional Moonwatch
Certified
Co-Axial Master Chronometer
7 000
+ €100 for shipping
Popular
Rolex Datejust 41
Wave Dial Grün - 11/2023 - LC100 - Neu / Ungetragen - Fullset
14 850
+ €45 for shipping
Popular
Tudor Black Bay Fifty-Eight
Certified
79030N Fullset aus 2022
3 490
+ €149 for shipping
Promoted
Rolex Submariner (No Date)
41mm Unworn 2024 Box & Papers 124060
13 109
+ €119 for shipping
Titus
Chronograph
490
Excl. shipping
Private Seller
Rolex GMT-Master II
New 2023
19 699
+ €369 for shipping
Popular
Rolex Datejust 41
Green NEW 2023 Full Stickers
13 800
+ €200 for shipping
TAG Heuer Autavia
Chronometer
2 490
Free shipping
Promoted
Omega Speedmaster Professional Moonwatch
Certified
Hesalit
7 081
+ €120 for shipping
Rolex GMT-Master II
Sprite Oyster 126720VTNR
20 110
+ €309 for shipping
Rolex GMT-Master II
Certified
Sprite 8/2022 Box&Papers Like new
18 199
+ €150 for shipping
Omega Speedmaster Professional Moonwatch Moonphase
Certified
Blue Side Ceramic
10 900
+ €100 for shipping
Promoted
Breitling Chronospace
Certified
Ref. A78365 48 mm Very Good Conditions Full Set
2 690
+ €199 for shipping
Promoted
Rolex Sea-Dweller
Red Writing 43mm Unworn 2023 Box & Papers 126600
14 186
+ €119 for shipping
Popular
Rolex Submariner Date
New 2023
13 900
+ €369 for shipping
Rolex Submariner (No Date)
124060 NEW 2023
12 600
+ €200 for shipping
Popular
Rolex Submariner Date
Certified
FullSet / 09.2021 / Lc: EU
12 750
+ €99 for shipping
Promoted
Omega Seamaster Diver 300 M
Certified
42mm
5 417
+ €120 for shipping
Popular
Omega Speedmaster Professional Moonwatch
Certified
Apollo 11 50th
12 804
+ €99 for shipping
Rolex Sea-Dweller
Certified
Single Red - 2019 - LC100 - Wie Neu - Fullset
12 950
+ €45 for shipping
Rolex GMT-Master II
Certified
New 2023 - 126720VTNR-0002 - Jubilee - Sprite
19 200
+ €89 for shipping
Popular
Omega Seamaster Diver 300 M
Certified
– Like New – Schwarz – Box & Papiere
4 679
+ €39 for shipping
Popular
Tudor Black Bay 54
Certified
Rubber 79000N Unworn Full Set 2023 M79000N-0002
3 850
Free shipping
Omega Speedmaster Professional Moonwatch
3861 Hesalite 310.30.42.50.01.001
5 377
+ €156 for shipping
Popular
Rolex GMT-Master II
Ref.126720VTNR Sprite Eu 2023 ungetragen unworn
19 490
+ €80 for shipping
Promoted
Longines Record
38,5 mm - COSC - Full Set - 09/2023 - Longines Guarantee Currently Valid
1 200
+ €139 for shipping
Popular
Omega Seamaster Planet Ocean
600M Summer Edition Diver Blue 2023 Bracelet
6 888
+ €188 for shipping
Popular
Rolex Datejust 41
Wimbledon
13 000
+ €59 for shipping
Promoted
Omega Constellation
Coaxial Master Chronometer
3 850
+ €79 for shipping
Rolex Submariner (No Date)
41mm No Date
13 500
+ €320 for shipping
Promoted
Ulysse Nardin Diver Chronometer
Certified
Maxi Marine Diver Chronometer 44mm Steel Box+Papers 2016 Ref: 263-10
3 900
+ €100 for shipping
Popular
Omega Speedmaster Professional Moonwatch
310.32.42.50.01.001 Hesalite 42mm
4 844
+ €93 for shipping
Rolex Sea-Dweller
43mm Black Dial 126600
12 605
+ €156 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.