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Urwerk UR-210 UR-210BPT Royal Hawk Very good Platinum 53.6mm Automatic
TOP
Urwerk UR-210 BPT Royal Hawk.
R 1 925 687
Verified Dealer
11
US
Rolex Submariner Date 16610LV Very good Steel 40mm Automatic
TOP
Rolex Submariner Kermit 16610LV
R 593 803
Free shipping
Verified Dealer
485
UK
Rolex Bubble Back 6085 Bubbleback WAFFLE Very good Yellow gold 34mm Automatic
TOP
Rolex OYSTER PERPETUAL CHRONOMETER 18K GOLD HONEYCOMB WABENBLATT
R 132 814
Verified Dealer
472
DE
Rolex Datejust Oysterquartz 17013 Good Gold/Steel 36mm Quartz
Rolex Oysterquartz 17013 Stahl Gold Klassiker Quartz Champagne...
R 66 474
Verified Dealer
597
DE
Bremont Supermarine S2000/BK Unworn Steel 45mm Automatic South Africa, Randburg
Bremont Supermarine S2000 / BK
R 61 545
Private Seller
ZA
TAG Heuer Kirium WL5113 Good Steel 38mm Quartz South Africa, Waterfall
TAG Heuer Kirium
R 9 176
Private Seller
ZA
Ulysse Nardin Dual Time 223-22 Good Steel 37mm Automatic
TOP
Ulysse Nardin GMT Dual Time 223-22 Watch with Stainless Steel...
R 53 534
Free shipping
Verified Dealer
552
US
Rolex Sky-Dweller 326933 Unworn Gold/Steel 42mm Automatic
Rolex Sky-Dweller Steel/Gold White Dial With B&P 09/2018
R 249 338
Verified Dealer
327
BE
Breitling Chronomat 44 AB011012/B967/375A Good Steel 44mm Automatic South Africa, Johannesburg
Breitling Chronomat 44
R 54 999
Verified Dealer
ZA
Ball Engineer Hydrocarbon Nedu DC3026A-S6C-BE New Titanium 42mm Automatic
TOP
Ball Engineer Hydrocarbon NEDU Chronograph 42mm
R 69 815
Verified Dealer
44
NL
Zenith El Primero 65.0520.4026 Very good White gold 44mm Automatic
TOP
Zenith Grande Class Grande Date Rattrapante, Split Second,...
R 203 554
Verified Dealer
23
CH
Breitling 634360 Very good Steel 44mm Automatic
TOP
Breitling Edition Special Limited A25 Exemplaires - G34360
R 1 662 253
Free shipping
Verified Dealer
585
NL
Rolex Air King 114234 Good Steel 34mm Automatic South Africa, Cape Town
Rolex Air King
R 89 999
Verified Dealer
ZA
Sinn 103 103.0619 New Steel 41mm Automatic
TOP
Sinn 103 St Sa RB Classic Watch Sondermodell
R 40 725
Verified Dealer
79
DE
Rolex Lady-Datejust 179138 New Yellow gold 26mm Automatic
TOP
Rolex Lady-Datejust 26, new, closing sale - off. price: 33.600...
R 344 398
Verified Dealer
39
CH
Ulysse Nardin Marine Chronometer Manufacture 1185-126 Very good Steel 43mm Automatic
TOP
Ulysse Nardin Marine Chronometer 1185-126 Watch with 18k Rose...
R 234 164
Free shipping
Verified Dealer
552
US
Omega Seamaster Planet Ocean Chronograph 2218.50.00 Very good Steel 45.5mm Automatic
Omega Seamaster Planet Ocean Chronograph
R 60 672
Verified Dealer
1350
NL
Omega Constellation Ladies 123.25.31.20.55.002 Very good Steel Automatic South Africa, Johannesburg
Omega Constellation Ladies
R 98 999
Verified Dealer
ZA
Breitling Montbrillant A41330 Good Steel 38mm Automatic South Africa, Pretoria
Breitling Montbrillant
R 39 900
Verified Dealer
ZA
Omega Speedmaster 310.20.42.50.01.001 New Steel 42mm Manual winding
Omega Speedmaster Apollo 11 50th Anniversary 310.20.42.50.01.001
R 187 947
Free shipping
Verified Dealer
23
US
Rolex Daytona 116520 Very good Steel 40mm Automatic
Rolex Daytona
R 279 259
Verified Dealer
 
IT
Rolex Daytona 116500LN Very good Steel 40mm Automatic
Rolex Daytona 116500LN Boite / Papiers
R 364 865
Verified Dealer
18
FR
Breitling Avenger II A1338111/BC32 New Steel 43mm Automatic
Breitling Avenger II
R 68 539
Verified Dealer
 
US
Rolex Lady-Datejust Pearlmaster 80285 New Rose gold 29mm Automatic
TOP
Rolex Lady-Datejust Pearlmaster 29, new, sell-off, o.p.: 82400...
R 845 454
Verified Dealer
39
CH
Chopard Mille Miglia 168566-3002 Very good Steel 43mm Automatic
TOP
Chopard Mille Miglia GTS Power Control 168566-3002 Watch with...
R 67 784
Free shipping
Verified Dealer
552
US
Omega Speedmaster Professional Moonwatch 311.33.42.50.01.001 Very good Steel 42mm Manual winding
Omega Speedmaster Professional Moonwatch 50th
R 132 149
Verified Dealer
 
FR
Omega Seamaster Aqua Terra 231.10.42.21.01.001 Very good Steel Automatic South Africa, Johannesburg
Omega Seamaster Aqua Terra
R 59 999
Verified Dealer
ZA
Jaeger-LeCoultre Geophysic 1958 8008520 New Steel 38.5mm Automatic South Africa, Pretoria
Jaeger-LeCoultre Geophysic Mens Watch
R 139 900
Verified Dealer
ZA
Omega Speedmaster Professional Moonwatch 311.93.44.51.03.001 Very good Titanium 44.2mm Automatic
Omega Speedmaster Titanium Co-Axial Chronograph Moonwatch
R 121 703
Free shipping
Verified Dealer
23
US
Omega Speedmaster Professional Moonwatch 3570.50.00 Very good Steel 42mm Manual winding
Omega Speedmaster Professional Moonwatch
R 55 685
Verified Dealer
 
IT
Rolex Sea-Dweller Deepsea 126660 Very good Steel 44mm Automatic
Rolex Sea-Dweller Deepsea (LC100)
R 240 860
Verified Dealer
23
DE
Audemars Piguet Royal Oak Offshore Chronograph 26170ST Very good Steel 42mm Automatic
Audemars Piguet AP Royal Oak Offshore FULLY ICED OUT Diamonds
R 727 485
Verified Dealer
135
DE
Rolex Pearlmaster 81208 New Yellow gold 34mm Automatic
TOP
Rolex Pearlmaster 34, new, closing sale - off. price: 33.800 CHF
R 328 740
Verified Dealer
39
CH
Ulysse Nardin Marine Chronometer Manufacture 1183-126 Very good Steel 43mm Automatic
TOP
Ulysse Nardin Marine Chronometer 1183-126 Watch with Leather...
R 84 730
Free shipping
Verified Dealer
552
US
Rolex Yacht-Master 37 268655 Unworn Rose gold 37mm Automatic
Rolex Yacht-Master 37 Or Rose New Boite / Papiers
R 307 517
Verified Dealer
18
FR
Omega Constellation Double Eagle 1514.20.00 Fair Steel Automatic South Africa, Johannesburg
Omega Constellation Double Eagle
R 44 999
Verified Dealer
ZA
Breitling a49350L2/ba07 Good Steel 41mm Automatic South Africa, Pretoria
Breitling Cockpit 41
R 59 900
Verified Dealer
ZA
Rolex GMT-Master II 116710LN Very good Steel 40mm Automatic
Rolex 116710LN GMT Master II Ceramic SS (33946)
R 167 920
Verified Dealer
453
US
Rolex Daytona 116528 Very good Yellow gold 40mm Automatic
Rolex Daytona
R 531 921
Verified Dealer
 
IT
Breitling Navitimer World A24322 Good Steel 46mm Automatic
Breitling Navitimer World
R 74 635
Verified Dealer
23
DE
Rolex GMT-Master 16700 Very good Steel 40mm Automatic
Rolex GMT-Master Pepsi 16700
R 177 447
Free shipping
Verified Dealer
485
UK
Rolex Lady-Datejust 179384 New Steel 26mm Automatic
TOP
Rolex Lady-Datejust 26, new, closing sale - off. price: 17.500...
R 172 160
Verified Dealer
39
CH
Ulysse Nardin Marine Chronometer Manufacture 1185-126-3T/45 Very good Steel 43mm Automatic
TOP
Ulysse Nardin Marine Chronometer 1185-126-3T/45 Watch with...
R 95 514
Free shipping
Verified Dealer
552
US
Rolex Explorer II 16570 Very good Steel 40mm Automatic
Rolex Explorer Camouflage Kalaschnikow Engraved Graviert Unikat
R 182 482
Verified Dealer
135
DE
Rolex Submariner Date 16613T Fair Gold/Steel 40mm Automatic South Africa, Johannesburg
Rolex Submariner Date
R 129 999
Verified Dealer
ZA
Breitling Bentley Motors A25362 Good Steel 48mm Automatic South Africa, Pretoria
Breitling Bentley Motors
R 64 900
Verified Dealer
ZA
A. Lange & Söhne Datograph 403.035 Very good Platinum 39mm Manual winding
A. Lange & Söhne 403.035 Datograph Flyback 403.035 Platinum...
R 654 734
Verified Dealer
453
US
Rolex Daytona 116518 Very good Yellow gold 40mm Automatic
Rolex Daytona
R 312 504
Verified Dealer
 
IT
Omega Seamaster Planet Ocean Chronograph 232.30.46.51.01.003 Good Steel 45,5mm Automatic
Omega Seamaster Planet Ocean Chronograph
R 79 622
Verified Dealer
23
DE
Rolex Yacht-Master II 116688 Unworn Yellow gold 44mm Automatic
Rolex Yacht-Master II 116688
R 613 630
Free shipping
Verified Dealer
485
UK
Hublot Classic Fusion Ultra-Thin 515.NX.1270.LR New Titanium 45mm Manual winding
TOP
Hublot Classic Fusion Ultra-Thin 45, new, sell-off, o.p.:...
R 117 357
Verified Dealer
39
CH
Panerai Luminor PAM 124 Very good Titanium 44mm Automatic
TOP
Panerai Luminor PAM 124 Watch with Stainless Steel, Titanium...
R 101 676
Free shipping
Verified Dealer
552
US
Omega Speedmaster Professional Moonwatch 31192445101003 New Ceramic 44mm Automatic
Omega Speedmaster Moonwatch Dark Side Of The Moon - NEW 2020 -...
R 114 695
Verified Dealer
748
MC
Omega Seamaster Diver 300 M 22545000 Good Steel 41mm Automatic South Africa, Johannesburg
Omega Seamaster Diver 300 M
R 34 999
Verified Dealer
ZA
Breitling Bentley 6.75 A44362 Good Steel 48mm Automatic South Africa, Pretoria
Breitling Bentley 6.75
R 69 900
Verified Dealer
ZA
Rolex Explorer 114270 Very good Steel 36mm Automatic
Rolex 114270 Explorer I 114270 36MM (33896)
R 107 068
Verified Dealer
453
US
Rolex Daytona 116505 Very good Rose gold 40mm Automatic
Rolex Daytona
R 535 246
Verified Dealer
 
IT
Rolex GMT-Master II 116710BLNR Unworn Steel 40mm Automatic
Rolex GMT-Master II 116710BLNR NEW "Batman" Boite/Papiers
R 274 272
Verified Dealer
18
FR
Rolex Submariner Date 16610 Very good Steel 40mm Automatic
Rolex Submariner Date 16610
R 148 699
Free shipping
Verified Dealer
485
UK
Chaumet Liens W23870-02A New Rose gold 33mm Automatic
TOP
Chaumet Liens 33, new, closing sale - official price: 14.410 CHF
R 86 103
Verified Dealer
39
CH
Rolex Sea-Dweller Deepsea 116660 Very good Steel 44mm Automatic
Rolex Deepsea SUGAR ICE B+P Diamomnds LC100 Sea-Dweller
R 272 393
Verified Dealer
135
DE
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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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