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Tudor Heritage Black Bay Automatik Dark 79230DK Lederband
TOP
Tudor Heritage Black Bay Automatik Dark 79230DK Lederband
2,940 
Seller
Uhren2000 GmbH
219
DE
Chopard MILLE MIGLIA Auto CLASSIC YACHTING 2012
TOP
Chopard MILLE MIGLIA Auto CLASSIC YACHTING 2012
3,690 
Seller
Chronographe.fr
 
FR
Rolex LADY DATEJUST DIAMANT 18K GOLD GELBGOLD SERVICE 01/2017
TOP
Rolex LADY DATEJUST DIAMANT 18K GOLD GELBGOLD SERVICE 01/2017
6,790 
Seller
Timeless Watches GmbH
105
DE
Zenith Elite HW Power Reserve Limited Edition No. 1480
TOP
Zenith Elite HW Power Reserve Limited Edition No. 1480
3,424 
Seller
Vintage Watch Services
127
NL
Rolex Milgauss 116400GV Z-BLUE worn once
TOP
Rolex Milgauss 116400GV Z-BLUE worn once
6,700 
Free shipping
Seller
MASTROLORENZI S.A.S DI MATTIA MASTROLORENZI & CO.
47
IT
Breitling Super Avenger Chronograph Stahl 48 mm white massive...
TOP
Breitling Super Avenger Chronograph Stahl 48 mm white massive...
2,999 
Seller
Uhrenkapital
193
DE
Breitling Chronomat Blackbird Special  Serie
TOP
Breitling Chronomat Blackbird Special Serie
2,450 
Seller
Juwelier Edmund Arnold GmbH
9
DE
Mido Big Ben Chronometer Automatik Limited Edition
TOP
Mido Big Ben Chronometer Automatik Limited Edition
1,349 
Seller
T&N "Glücksschmiede" GmbH
471
DE
Rolex Sea-Dweller 4000 SD4K 116600 LC 100  2014 B-P
TOP
Rolex Sea-Dweller 4000 SD4K 116600 LC 100 2014 B-P
10,390 
Free shipping
Seller
Uhrtreff
70
DE
IWC Aquatimer Chronograph
TOP
IWC Aquatimer Chronograph
4,200 
Free shipping
Seller
Relojes y Diamantes S.L.
10
ES
Omega Constellation Pie Pan 18K Gold Automatic Service 11/17
TOP
Omega Constellation Pie Pan 18K Gold Automatic Service 11/17
3,990 
Seller
Timeless Watches GmbH
105
DE
Omega Seamaster Planet Ocean
TOP
Omega Seamaster Planet Ocean
4,200 
Seller
Seven Luxury
23
IT
Omega Constellation Automatic Chronometer
TOP
Omega Constellation Automatic Chronometer
1,168 
Seller
Vintage Watch Services
127
NL
Rolex Air-King 116900 Never Worn
TOP
Rolex Air-King 116900 Never Worn
6,200 
Free shipping
Seller
MASTROLORENZI S.A.S DI MATTIA MASTROLORENZI & CO.
47
IT
A. Lange & Söhne Richard Lange Perpetual Calendar “Terraluna
A. Lange & Söhne Richard Lange Perpetual Calendar “Terraluna
176,000 
Seller
Premium Watches
10
FI
Junghans 1972 Chronoscope
Junghans 1972 Chronoscope
380 
Seller
Private seller
FI
Louis Moinet Memoris Red Eclipse
Louis Moinet Memoris Red Eclipse
95,542 
BrandBoutique Member
Louis Moinet
Rolex Daytona Chronograph 116520 D-Serie
TOP
Rolex Daytona Chronograph 116520 D-Serie
10,890 
Free shipping
Seller
Uhrtreff
70
DE
Omega Speedmaster Moonwatch Moonphase , 2017 NEW
TOP
Omega Speedmaster Moonwatch Moonphase , 2017 NEW
Price on request
Free shipping
Seller
WatchesNorte
ES
Tissot Heritage 160th Navigator Automatic T078.641.16.057.00
Tissot Heritage 160th Navigator Automatic T078.641.16.057.00
1,310 
Seller
iHodinarstvi.cz
21
CZ
Baume & Mercier Capeland Flyback Chronograph
Baume & Mercier Capeland Flyback Chronograph
6,900 
Seller
Gioielleria Mario Pendezza
18
IT
Rolex Sea-Dweller Deepsea
Rolex Sea-Dweller Deepsea
12,150 
Seller
Antwerp Watch Company
 
BE
Rolex Datejust 41MM Steel Blue Dial 'Fluted Bezel'...
TOP
Rolex Datejust 41MM Steel Blue Dial 'Fluted Bezel'...
7,550 
Free shipping
Seller
M.J.WATCHES
49
BE
Patek Philippe Fixed Price Perpetual Calendar Chronograph...
Patek Philippe Fixed Price Perpetual Calendar Chronograph...
199,900 
Seller
Premium Watches
10
FI
Omega Seamaster 300 Spectre 007
TOP
Omega Seamaster 300 Spectre 007
6,890 
Seller
Deepsea
94
HU
Louis Moinet Memoris
Louis Moinet Memoris
47,675 
BrandBoutique Member
Louis Moinet
Rolex Day-Date 18039 WG 18k  Single Quick Vintage
TOP
Rolex Day-Date 18039 WG 18k Single Quick Vintage
12,190 
Free shipping
Seller
Uhrtreff
70
DE
Rolex Datejust Stainless Steel 69174
Rolex Datejust Stainless Steel 69174
3,585 
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
82
UK
Ball Engineer Hydrocarbon DeepQUEST (full manufacturer warranty)
Ball Engineer Hydrocarbon DeepQUEST (full manufacturer warranty)
2,899 
Seller
iHodinarstvi.cz
21
CZ
Patek Philippe Perpetual Calendar Chronograph
TOP
Patek Philippe Perpetual Calendar Chronograph
104,900 
Seller
Joaillerie Royale
266
BE
Rolex Sea-Dweller
Rolex Sea-Dweller
13,031 
Seller
CARR
UK
Seiko GRAND SEIKO SBGH257 LIMITED EDITION 500PCS
TOP
Seiko GRAND SEIKO SBGH257 LIMITED EDITION 500PCS
10,788 
Free shipping
Seller
Przedsiębiorstwo Handlowe Usługowe
48
PL
Omega Seamaster 300 Spectre Limited Edition James Bond
Omega Seamaster 300 Spectre Limited Edition James Bond
9,000 
Seller
Premium Watches
10
FI
Rolex Yacht-Master Gold/Steel 40MM Black Dial Full Set 116621
TOP
Rolex Yacht-Master Gold/Steel 40MM Black Dial Full Set 116621
11,100 
Free shipping
Seller
M.J.WATCHES
49
BE
Rolex Datejust41 Cadran Rhodium
TOP
Rolex Datejust41 Cadran Rhodium
7,850 
Seller
41 WATCH
 
FR
Omega Seamaster Planet Ocean
TOP
Omega Seamaster Planet Ocean
3,870 
Seller
Swiss Time Traders
 
UK
Rolex Daytona Gold Mother Of Pearl Dial Baguette Diamond Bezel
TOP
Rolex Daytona Gold Mother Of Pearl Dial Baguette Diamond Bezel
56,849 
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
82
UK
Breitling Chronomat 41
TOP
Breitling Chronomat 41
4,262 
Free shipping
Seller
Swiss Timepieces LTD
11
UK
Breitling Navitimer Cosmonaute
TOP
Breitling Navitimer Cosmonaute
7,950 
Seller
Joaillerie Royale
266
BE
Rolex Sea-Dweller Deepsea
Rolex Sea-Dweller Deepsea
12,514 
Seller
CARR
UK
Omega De Ville Prestige Co Axial
TOP
Omega De Ville Prestige Co Axial
2,106 
Seller
David Summerfield Ltd
14
UK
Ulysse Nardin UN Maxi Marine Chronometer 43mm
TOP
Ulysse Nardin UN Maxi Marine Chronometer 43mm
9,658 
Seller
Noblesse LP
12
UK
Chopard Mille Miglia Gran Turismo XL 44 Tachymeter L.E. NEW
TOP
Chopard Mille Miglia Gran Turismo XL 44 Tachymeter L.E. NEW
5,200 
Seller
Timepiece Bank
224
BE
Breitling Superocean Héritage 46
TOP
Breitling Superocean Héritage 46
2,950 
Seller
41 WATCH
 
FR
Omega Seamster Aqua Terra 'Good Planet' NEW
TOP
Omega Seamster Aqua Terra 'Good Planet' NEW
4,268 
Seller
Tempo and Time Ltd
UK
Rolex 18k W/Gold Unworn Pavé Diamond Dial Daytona B&P...
TOP
Rolex 18k W/Gold Unworn Pavé Diamond Dial Daytona B&P...
108,120 
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
82
UK
Patek Philippe Régulateur Quantième annuel 5235 Full Set
TOP
Patek Philippe Régulateur Quantième annuel 5235 Full Set
37,500 
Free shipping
Seller
RIVIERAWATCH
55
FR
Baume & Mercier Classima Executives Chronograph Moonphase
TOP
Baume & Mercier Classima Executives Chronograph Moonphase
3,150 
Seller
Joaillerie Royale
266
BE
Omega Seamaster Planet Ocean 215.30.44.21.03.001
TOP
Omega Seamaster Planet Ocean 215.30.44.21.03.001
4,205 
Seller
JPA Watch Company Ltd
13
UK
Ulysse Nardin Maxi Marine Diver Rose Gold
TOP
Ulysse Nardin Maxi Marine Diver Rose Gold
11,899 
Seller
Deepsea
94
HU
Rolex Datejust
Rolex Datejust
7,899 
Seller
Juwelier Rubin GbR
 
DE
Breitling Bentley Motors
TOP
Breitling Bentley Motors
3,699 
Seller
Kings Hill Jewellery
 
UK
Rolex Datejust41 Cadran Bleu
TOP
Rolex Datejust41 Cadran Bleu
7,850 
Seller
41 WATCH
 
FR
Omega Seamaster Aqua Terra Gauss 15000   	231.10.42.21.01.002
TOP
Omega Seamaster Aqua Terra Gauss 15000 231.10.42.21.01.002
3,092 
Free shipping
Seller
Przedsiębiorstwo Handlowe Usługowe
48
PL
Rolex S/S Unworn O/P Black Dial Ceramic Bezel Daytona B&P...
TOP
Rolex S/S Unworn O/P Black Dial Ceramic Bezel Daytona B&P...
16,787 
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
82
UK
Panerai Luminor Marina Automatic -Full Set + Service 02/2016-
TOP
Panerai Luminor Marina Automatic -Full Set + Service 02/2016-
4,900 
Free shipping
Seller
KronologY
21
FR
Jaeger-LeCoultre Amvox5 Worldtime Automatic Chronograph...
TOP
Jaeger-LeCoultre Amvox5 Worldtime Automatic Chronograph...
9,900 
Seller
Joaillerie Royale
266
BE
Omega Seamaster Planet Ocean Gmt 232.30.44.22.03.001
TOP
Omega Seamaster Planet Ocean Gmt 232.30.44.22.03.001
4,888 
Seller
JPA Watch Company Ltd
13
UK
Omega Vintage Speedmaster, Straight Writing
TOP
Omega Vintage Speedmaster, Straight Writing
6,260 
Free shipping
Seller
Tempvs Ltd
58
UK
Bremont U2 SS – 2014 – Full Set
TOP
Bremont U2 SS – 2014 – Full Set
2,504 
Seller
Oakleigh Watches
15
UK
Omega Seamaster Diver James Bond Limited 2017 Commanders watch
TOP
Omega Seamaster Diver James Bond Limited 2017 Commanders watch
4,690 
Seller
Timepiece Bank
224
BE

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.