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Rolex Daytona 116599RBR Unworn White gold 40mm Automatic
TOP
Rolex Daytona 116599RBR
R 981 789
Free shipping
Verified Dealer
455
UK
Rolex Daytona 116520 Very good Steel 40mm Automatic
TOP
Rolex Daytona 116520
R 265 348
Free shipping
Verified Dealer
455
UK
Rolex Submariner Date 16610LV Very good Steel 40mm Automatic
TOP
Rolex Submariner Kermit 16610LV
R 383 281
Free shipping
Verified Dealer
455
UK
Breitling Montbrillant Légende C23340 Very good Gold/Steel 47mm Automatic
TOP
Breitling Montbrillant Légende C23340 18k/SS Box & Papers
R 93 446
Free shipping
Verified Dealer
218
US
Omega Seamaster 222.18.42.20.01.001 New Steel 42mm Automatic
Omega Seamaster Planet Ocean 600M Co-Axial 42mm Steel Diamond...
R 123 692
Verified Dealer
850
BE
Rolex Datejust 178288 New Yellow gold 31mm Automatic
TOP
Rolex Datejust 31, new, closing down sale - off. pr.: 37.700 CHF
R 370 992
Verified Dealer
30
CH
Ulysse Nardin 333-77 Good Steel 43mm Automatic
Ulysse Nardin Marine Acqua Perpetual Calendar Blue 333-77 Diver
R 153 398
Verified Dealer
US
Bremont Supermarine S2000/BK Unworn Steel 45mm Automatic South Africa, Randburg
Bremont Supermarine S2000 / BK
R 59 788
Private Seller
ZA
Omega Seamaster Aqua Terra 231.10.43.52.06.001 Very good Steel 43mm Automatic
Omega Seamaster Aqua Terra 231.10.43.52.06.001
R 74 754
Free shipping
Verified Dealer
94
US
Rolex Datejust Very good Steel 36mm Automatic
Rolex Mens Rolex Oyster Perpetual Datejust Stainless Steel
R 68 633
Verified Dealer
42
US
Heuer Very good Steel 51mm Manual winding
TOP
Heuer Compteur
R 7 572
Verified Dealer
56
CH
Rolex Daytona 116520 - LC100 Very good Steel Automatic
Rolex Daytona Ø 40 mm - Box & Papiere von 2015
R 328 738
Verified Dealer
219
DE
Porsche Design 1919 6023.6.04.004.07.2 New Titanium 42mm Automatic
Porsche Design 1919 Chronotimer Flyback Brown & Leather
R 74 033
Verified Dealer
2629
DE
Rolex GMT-Master 16700 Good Steel 40mm Automatic
TOP
Rolex GMT-Master 16700 40 MM steel full set serviced
R 147 766
Verified Dealer
56
IT
Rolex Lady-Datejust Pearlmaster 80319 New White gold 29mm Automatic
TOP
Rolex Pearlmaster 29, closing down sale, o.p.: 31000 CHF
R 272 562
Verified Dealer
30
CH
Mido Multifort M038.431.16.031.00 New Steel 42mm Automatic
Mido Multifort III Gent Automatik Chronometer M038.431.16.031.00
R 18 097
Verified Dealer
4604
DE
Breitling Chrono-Matic (submodel) 2110 Very good Steel 40mm Automatic
Breitling 2110 Breitling Chrono-Matic
R 57 191
Private Seller
CZ
Omega Seamaster Diver 300 M 210.30.42.20.01.001 Good Steel 42mm Quartz South Africa, Johannesburg
Omega Seamaster Professional 300m
R 29 999
Verified Dealer
ZA
Breitling Superocean 44 C1739112/BA77 Very good Steel 44mm Automatic
Breitling SUPEROCEAN 44 GOLD BEZEL FULL SET
R 55 922
Verified Dealer
87
PL
Rolex Lady-Datejust 69178 Very good Yellow gold 26mm Automatic
Rolex President 69178 Pre-owned
R 127 208
Verified Dealer
141
US
Rolex Datejust 16014 Very good Steel 36mm Automatic
Rolex Mens Rolex Datejust 16014 Black Diamond Sapphire 18k...
R 71 820
Free shipping
Verified Dealer
18
US
Rolex Air King 114234 Good Steel 34mm Automatic South Africa, Cape Town
Rolex Air King
R 89 999
Verified Dealer
ZA
Omega Seamaster Planet Ocean 168.1650 Very good Steel 45mm Automatic
TOP
Omega Seamaster Planet Ocean 600M steel Serviced Box
R 46 488
Verified Dealer
56
IT
Breguet Reine de Naples 8967ST/V8/J50 New Steel 43mm Automatic
TOP
Breguet Reine de Naples, new, closing down sale, off. pr....
R 158 988
Verified Dealer
30
CH
Rolex Submariner Very good Steel Automatic
Rolex Submariner Green Ceramic Bezel & Dial "HULK" 40mm
R 209 445
Verified Dealer
97
US
Rolex Sky-Dweller 326933 Unworn Gold/Steel 42mm Automatic
Rolex Sky-Dweller Stahl Gelbgold Automatik Armband Oyster 42mm...
R 295 516
Verified Dealer
1220
DE
Breitling Navitimer 1461 M1938022.BD20.100W.M20BASA.1 Very good South Africa, Johannesburg
Breitling Navitimer 1461
R 106 400
Verified Dealer
ZA
Chopard Mille Miglia 168589-3006 New Steel 42mm Automatic
Chopard Mille Miglia Race Edition 168589-3006
R 57 430
Verified Dealer
32
GI
Omega Speedmaster Professional Moonwatch 310.20.42.50.01.001 New Steel 42mm Manual winding
Omega Speedmaster Moonwatch Apollo 11 50th Anniversary - NEW
R 183 778
Verified Dealer
9
UK
Rolex Oyster Perpetual Lady Date 6916 Very good Steel 26mm Automatic
Rolex Ladies Rolex Datejust Silver Diamond 18k White Gold &...
R 47 741
Free shipping
Verified Dealer
18
US
Rolex Sea-Dweller 126600 New Steel 43mm Automatic
Rolex Sea-Dweller | LC100 | NEU
R 230 781
Verified Dealer
48
DE
Rolex GMT-Master II 16760 Good Steel 40mm Automatic
TOP
Rolex GMT-Master II 16760 Fat Lady Serviced
R 144 446
Verified Dealer
56
IT
Hublot Classic Fusion Ultra-Thin 515.NX.1270.LR New Titanium 45mm Manual winding
TOP
Hublot Classic Fusion Ultra-Thin 45, new, sellout, o.p.:...
R 105 987
Verified Dealer
30
CH
Omega Seamaster Planet Ocean New 43.5mm Automatic
Omega Seamaster Planet Ocean Men's Auto Coaxial Black Watch...
R 77 822
Free shipping
Verified Dealer
11
US
Rolex Milgauss 116400 Unworn Steel 40mm Automatic
Rolex Oyster Perpetual Milgauss Stahl Automatik Armband Oyster...
R 115 706
Verified Dealer
1220
DE
Omega Seamaster Planet Ocean Chronograph 215.30.46.51.01.001 Good Steel 45.5mm Automatic South Africa, Johannesburg
Omega Seamaster Planet Ocean Chronograph
R 59 999
Verified Dealer
ZA
Breitling Super Avenger II A1337111/G779 Very good Steel 48mm Automatic
Breitling Super Avenger II Mens Steel 48mm Watch B&Ps
R 54 052
Verified Dealer
75
UK
Omega Seamaster Aqua Terra 220.12.41.21.03.002 New Steel 41mm Automatic
Omega Seamaster Aqua Terra 150m Co-axial Master Chronometer - NEW
R 68 794
Verified Dealer
9
UK
Rolex Explorer 114270 Very good Steel 36mm Automatic
Rolex Mens Rolex Explorer I 114270 Yr 2003 Stainless Steel...
R 82 162
Free shipping
Verified Dealer
18
US
Rolex Datejust 126334 Very good Steel 41mm Automatic
Rolex Datejust 41 | 126334
R 164 369
Verified Dealer
48
DE
Rolex Oyster Perpetual Lady Date 6517 Very good Yellow gold 26mm Automatic
TOP
Rolex Oyster Perpetual Lady Date 26 mm gold 18 kt serviced
R 46 488
Verified Dealer
56
IT
Chaumet Liens W23870-02A New Rose gold 33mm Automatic
TOP
Chaumet Liens 33, new, closing down sale, official price:...
R 83 272
Verified Dealer
30
CH
Rolex Datejust 16013 Very good Gold/Steel 36mm Automatic
Rolex Datejust 36 Steel/Gold Jubilee Tapestry Dial
R 71 393
Verified Dealer
1257
NL
Rolex GMT-Master II 116719BLRO Good White gold 40mm Automatic
Rolex GMT-Master II, 116719 BLRO, LC 100, 2017, Full Set
R 531 128
Verified Dealer
40
DE
Breitling Superocean Héritage Chronograph A1332024/B908/152A Good Steel 46mm Automatic South Africa, Johannesburg
Breitling Superocean Héritage Chronograph
R 52 999
Verified Dealer
ZA
Omega Speedmaster Professional Moonwatch Moonphase 304.33.44.52.03.001 Good Steel 44.2mm Automatic South Africa, Pretoria
Omega Speedmaster Professional Moonwatch Moonphase
R 84 900
Verified Dealer
ZA
Omega Seamaster Diver 300 M 212.30.44.50.03.001 New Steel 44mm Automatic
Omega Seamaster Diver 300m Co-axial Chrono 44mm - NEW 2019
R 66 828
Verified Dealer
9
UK
Rolex Datejust 16013 Very good Steel 36mm Automatic
Rolex Mens Datejust Blue Vignette Sapphire Diamond 18k Yellow...
R 79 303
Free shipping
Verified Dealer
18
US
Rolex Datejust 126334 New Steel 41mm Automatic
Rolex Datejust 41 | NEU | UNGETRAGEN | FULLSET
R 175 991
Verified Dealer
48
DE
Zenith Captain Chronograph 824238 Good Yellow gold 35mm Automatic
TOP
Zenith Chronometre vintage automatic Captain 18k gold serviced
R 46 488
Verified Dealer
56
IT
Hublot Classic Fusion Ultra-Thin 545.OX.2210.LR New Rose gold 45mm Manual winding
TOP
Hublot Classic Fusion Ultra-Thin, closing down sale, o.p....
R 227 132
Verified Dealer
30
CH
Rolex Day-Date Oysterquartz 19018 Good Yellow gold 36mm Quartz
Rolex Oysterquarz Daydate
R 119 541
Free shipping
Verified Dealer
762
DE
Rolex Sea-Dweller 4000 16600 New Steel 40mm Automatic
Rolex Sea-Dweller, Y-Serie, 16600, Full Set, Flat Four, LC 100
R 248 878
Verified Dealer
40
DE
TAG Heuer Grand Carrera CAV5186.FC6304 Good Titanium Automatic South Africa, Johannesburg
TAG Heuer Grand Carrera
R 108 999
Verified Dealer
ZA
Rolex Explorer II 216570 Very good Steel 42mm Automatic
Rolex Explorer II 216570 - White 42mm
R 122 704
Verified Dealer
8
US
Omega Seamaster Planet Ocean 215.92.46.22.03.001 New Ceramic 45.5mm Automatic
Omega Seamaster Planet Ocean Co-axial GMT (Big Blue) - NEW 2019
R 129 726
Verified Dealer
9
UK
Rolex Lady-Datejust 6917 Very good Steel 26mm Automatic
Rolex Ladies Rolex Datejust 18k White Gold Diamond Sapphire &...
R 47 741
Free shipping
Verified Dealer
18
US
Breitling Bentley Motors A25362 Very good Steel 48.7mm Automatic
Breitling Bentley Motors
R 69 732
Verified Dealer
1257
NL
Rolex Datejust 69068 Very good Yellow gold 26mm Automatic
TOP
Rolex Datejust 26 mm gold 750 rare ref. 69068 serviced
R 157 728
Verified Dealer
56
IT
Hublot Classic Fusion Ultra-Thin 515.NX.2210.LR New Titanium 45mm Manual winding
TOP
Hublot Classic Fusion Ultra-Thin 45, new, sellout, o.p.:...
R 105 987
Verified Dealer
30
CH
Rolex Day-Date Oysterquartz 19018 Very good Yellow gold 36mm Quartz
Rolex Oysterquarz Daydate
R 149 427
Free shipping
Verified Dealer
762
DE
Rolex Explorer II 16570 New Steel 40mm Automatic
Rolex 16570 Explorer II, G-Serie, Kal. 3186, LC 100, NOS
R 182 466
Verified Dealer
40
DE
Breitling Chronomat 44 AB011012/B967/375A Good Steel 44mm Automatic South Africa, Johannesburg
Breitling Chronomat 44
R 54 999
Verified Dealer
ZA
Rolex Datejust 126334 Very good Gold/Steel 41mm Automatic
Rolex Datejust 41 Ref. 126334
R 153 577
Verified Dealer
394
NL
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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.


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