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Omega Speedmaster Racing 326.30.40.50.01.001 Unworn Steel 40mm Automatic
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Omega Speedmaster RACING CO‑AXIAL CHRONOMETER CHRONOGRAPH 40...
R49 039
+ R2 329 for shipping
Professional dealer
4,91 (964)
JP
Rolex Datejust Oysterquartz 17013 Good Steel 36mm Quartz
Top
Rolex Oysterquartz Datejust 17013 White Roman Dial 18k Solid...
R100 655
+ R1 629 for shipping
Professional dealer
4,89 (56)
US
Rolex Day-Date 36 18248 Very good Yellow gold 36mm Automatic
Top
Rolex Day-Date President
R419 663
+ R3 341 for shipping
Professional dealer
5,00 (12)
US
Rolex Submariner Date 126610LN New Steel 41mm Automatic
Top
Rolex 2022 Submariner Date(New)126610LN full set.
R268 638
Free shipping
Professional dealer
4,62 (5)
KR
Omega Seamaster Aqua Terra 220.10.43.22.03.001 Very good Steel 43mm Automatic South Africa, Paarl
Omega Seamaster Aqua Terra
R149 693
Free shipping
Professional dealer
5,00 (3)
UK
Seiko 702676 Very good 46mm Quartz South Africa, Centurion
Seiko 7T62-0HL0
R3 000
Excl. shipping
Private Seller
ZA
Omega Seamaster Diver 300 M 2551.80.00 Very good Steel 36mm Automatic
Omega Seamaster Diver 300M Midsize Chronometer Automatik Stahl...
R51 447
+ R1 570 for shipping
Sold by Chrono24
DE
Rolex Sea-Dweller 126600 New Steel 43mm Automatic
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Rolex Sea-Dweller 126600 Unworn New June 2022 Red 50Th...
R278 163
Free shipping
Professional dealer
4,92 (420)
ES
Rolex Datejust 41 126334 Very good Steel 41mm Automatic
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Rolex Datejust II Stainless Steel White Gold Silver Index Dial...
R196 425
Free shipping
Professional dealer
4,95 (298)
US
Breitling Colt Automatic A17388 Very good Steel 44mm Automatic South Africa, Pretoria
Breitling Colt Automatic
R48 950
Excl. shipping
Private Seller
ZA
Breitling Superocean Chronograph II A1334102/BA84 Very good Steel 44mm Automatic South Africa, Johannesburg
Breitling Superoceans Chrono Black Dial, Stainless Steel 44mm...
R53 999
Free shipping
Professional dealer
4,85 (269)
ZA
Omega Constellation 2852 Good Gold/Steel 35mm Automatic South Africa, Cape Town
Omega Constellation 2852-5 SC c.1955
R35 000
+ R259 for shipping
Professional dealer
4,86 (18)
ZA
Rolex Datejust II 116334 Very good Steel 41mm Automatic South Africa, 2196
Rolex Datejust II
R189 000
Excl. shipping
Private Seller
ZA
TAG Heuer Aquaracer 300M CAF101E.FT8011 Very good 5mm Manual winding South Africa, Johannesburg
TAG Heuer Aquaracer 300M
R15 000
Excl. shipping
Private Seller
ZA
Breitling Crosswind Racing B13355 Very good Gold/Steel 43mm Automatic South Africa, Cape town
Breitling Crosswind
R69 741
Excl. shipping
Private Seller
ZA
Ikepod AS5008 Very good Steel 45mm Automatic South Africa, George
Ikepod Seaslug Alarm world timer
R60 444
Excl. shipping
Private Seller
ZA
Omega Seamaster 300 233.32.41.21.01.001 Very good Steel 41mm Automatic
Omega Seamaster 300M "Spectre" Co-Axial Stahl 233.32.41.21.01....
R192 708
+ R2 790 for shipping
Sold by Chrono24
DE
Longines Oposition L3 618 4 Good Steel 38mm Quartz South Africa, 7708
Longines L3 618 4
R6 900
Excl. shipping
Private Seller
ZA
Chopard Mille Miglia 161268-5003 Very good Rose gold 44mm Automatic South Africa, Paarl
Chopard Miglia Gt Xl Mille
R149 693
Free shipping
Professional dealer
5,00 (3)
UK
TAG Heuer Formula 1 Quartz CA 1212 - 1 Very good Steel 38 mm excl. crownmm Quartz South Africa, Johannesburg
TAG Heuer Formula 1 Chronograph Professional 200 Me's Watch
R10 098
Excl. shipping
Private Seller
ZA
Omega Speedmaster Professional Moonwatch Moonphase 304.30.44.52.01.001 Very good Steel 44mm Automatic
Top
Omega Speedmaster Stainless Steel Moonphase Black Dial Watch
R179 635
Free shipping
Professional dealer
4,95 (298)
US
Rolex Sea-Dweller 126600 Unworn Steel 43mm Automatic South Africa, Johannesburg
Rolex Oyster Perpetual Date Sea-Dweller, Oystersteel 126600...
R319 999
Free shipping
Professional dealer
4,85 (269)
ZA
Omega Constellation 168.005 Fair Gold/Steel 34mm Automatic South Africa, Cape Town
Omega Constellation Pie Pan "Dog Leg" Lugs Serviced
R25 000
+ R259 for shipping
Professional dealer
4,86 (18)
ZA
Bremont MB MBII-BK/OR Very good Steel 43mm Automatic
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Bremont Martin Baker II Orange Side 2019 SERVICED BY BREMONT
R64 113
+ R813 for shipping
Professional dealer
4,96 (381)
UK
Omega Speedmaster Professional Moonwatch 31192445101003 Very good Ceramic 44.2mm Automatic
Omega Speedmaster Dark Side of The Moon Ceramic 31192445101003...
R152 389
+ R1 931 for shipping
Sold by Chrono24
UK
Omega Seamaster Diver 300 M 2531.80.00 Very good Steel 41mm Automatic
Omega Seamaster 300M Chronometer Automatik Edelstahl Herrenuhr...
R44 297
+ R1 570 for shipping
Sold by Chrono24
DE
Breitling Chronomat 44 Very good Steel 44mm Automatic
Top
Breitling Chronomat 44 Japan Limited Edition Gray Dial Watch...
R109 117
+ R1 662 for shipping
Professional dealer
4,86 (249)
US
Omega Seamaster Aqua Terra 231.10.42.21.02.003 coaxial 2019 Chronometer skeleton Very good Steel 41.5mm Automatic
Top
Omega Seamaster Aqua Terra (serviced) Master Co-axial Omega...
R68 887
Free shipping
Professional dealer
4,78 (108)
NL
Breitling Cockpit Lady B71356 Very good Gold/Steel 32mm Quartz South Africa, Paarl
Breitling Cockpit Lady
R42 693
Free shipping
Professional dealer
4,92 (32)
ZA
Rolex Sea-Dweller 126600 Very good Steel 43mm Automatic
Top
Rolex Sea-Dweller Stainless Steel Black Index Dial Watch 126600
R285 411
Free shipping
Professional dealer
4,95 (298)
US

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Breitling Galactic 32 A71356 Very good Steel 32mm Quartz South Africa, Johannesburg
Breitling Galactic Ladies, S/Steel on Leather, White Dial,...
R36 999
Free shipping
Professional dealer
4,85 (269)
ZA
Omega Constellation 14393 61 SC Fair Steel 34mm Automatic South Africa, Cape Town
Omega Constellation S.Steel "Pie-Pan"
R29 950
+ R259 for shipping
Professional dealer
4,86 (18)
ZA
Panerai Special Editions PAM 00127 Very good Steel 47mm Manual winding South Africa, Johannesburg
Panerai Luminor 1950 PAM00127, 'Fiddy', Rare, Limited Edition
R235 058
Free shipping
Professional dealer
4,95 (60)
ZA
Omega Seamaster Planet Ocean 232.90.46.21.03.001 Good Titanium 45.5mm Automatic
Omega Planet Ocean Titanium 232.90.46.21.03.001 - Accredited...
R101 586
+ R1 931 for shipping
Sold by Chrono24
UK
Tudor North Flag 91210N Very good Steel 40mm Automatic
Tudor North Flag Chronometer Automatik Stahl Herrenuhr Ref....
R81 094
+ R1 570 for shipping
Sold by Chrono24
DE
Breitling Navitimer 01 (46 MM) Unworn Steel 46mm Automatic
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Breitling Navitimer 1 B01 46mm Steel Black Dial Mens Watch...
R134 302
+ R1 662 for shipping
Professional dealer
4,86 (249)
US
Montblanc 1858 MB125583 New Bronze 42mm Automatic
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Montblanc 1858 Monopusher Chronograph (Limited Edition)
R95 918
Free shipping
Professional dealer
4,93 (588)
LV
Breitling Bentley 6.75 A44362 Very good Steel 48mm Automatic South Africa, Paarl
Breitling Bentley 6.75
R55 533
Free shipping
Professional dealer
4,92 (32)
ZA
Rolex Yacht-Master 168623 Unworn Gold/Steel 35mm Automatic
Top
Rolex Yacht-Master 2009 Yellow Gold 168623
R327 403
Free shipping
Professional dealer
4,95 (298)
US
Breitling Colt Chronograph A7338811.C905.173A Good Steel 44mm Quartz South Africa, Johannesburg
Breitling Colt Chrono S/Steel Blue Dial 44mm A73388 (2016)
R49 999
Free shipping
Professional dealer
4,85 (269)
ZA
Omega Constellation Day-Date 168.029 Very good Yellow gold 35mm Automatic South Africa, Cape Town
Omega Constellation 18k Gold "C-Case" Cal.751
R50 000
+ R259 for shipping
Professional dealer
4,86 (18)
ZA
Breitling Navitimer A17326211B1P1 Very good Steel 41mm Automatic South Africa, Johannesburg
Breitling Automatic 41 Navitimer Ref.A17326, Full Set 2020
R58 765
Free shipping
Professional dealer
4,95 (60)
ZA
Rolex Daytona 116519 Very good White gold 40mm Automatic
Rolex Daytona Sodalite White Gold 116519 - Just Serviced 24...
R1 320 858
+ R1 931 for shipping
Sold by Chrono24
UK
Omega Seamaster 300 234.30.41.21.03.001 Very good Steel 41mm Automatic
Omega Seamaster 300 Co-Axial Herrenuhr Ref. 234.30.41.21.03.00...
R100 278
+ R2 790 for shipping
Sold by Chrono24
DE
Rolex Daytona 116520 Good Steel 40mm Automatic
Top
Rolex Daytona
R473 458
+ R1 662 for shipping
Professional dealer
4,90 (38)
US
Rolex Datejust 41 126334 Unworn Steel Automatic
Rolex Datejust 41 Grey 2021 UNWORN
R261 595
+ R4 360 for shipping
Professional dealer
4,85 (9)
IT
Breitling Bentley 6.75 A44362 Very good Steel 48mm Automatic South Africa, Paarl
Breitling Bentley 6.75
R64 900
Free shipping
Professional dealer
4,92 (32)
ZA
Breitling EB2040101L1X1 Unworn Titanium 46mm Automatic
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Breitling Aviator Super 8 Titanium Green Arabic Dial Watch...
R63 785
Free shipping
Professional dealer
4,95 (298)
US
Breitling Transocean Unitime Pilot AB0510U6/BC26/159A Good Steel 46mm Automatic South Africa, Johannesburg
Breitling Transocean Unitime Pilot 46mm
R55 999
Free shipping
Professional dealer
4,85 (269)
ZA
Rolex Daytona 116520 Very good Steel 40mm Automatic
Rolex Daytona Citrus Lemon Dial Super Rare LC100 Collectors...
R4 534 311
+ R87 198 for shipping
Professional dealer
4,94 (154)
DE
Breitling Old Navitimer D13322 Good Gold/Steel Automatic South Africa, Johannesburg
Breitling Navitimer Chronograph Automatic 18K Gold
R83 949
Free shipping
Professional dealer
4,95 (60)
ZA
Rolex Daytona 116509 Good White gold 40mm Automatic
Rolex Daytona Beach White Gold 116509 - Just Serviced 24...
R2 641 736
+ R1 931 for shipping
Sold by Chrono24
UK
Rolex GMT-Master II 16710T Very good Steel 40mm Automatic
Rolex GMT-Master II "Pepsi" Oyster Perpetual Herrenuhr 16710T...
R328 738
+ R2 790 for shipping
Sold by Chrono24
DE
Omega Seamaster Aqua Terra 231.13.39.21.57.001 Very good Steel 38.5mm Automatic
Top
Omega Seamaster Aqua Terra
R67 076
+ R1 662 for shipping
Professional dealer
4,90 (38)
US
Omega Speedmaster Professional Moonwatch 310.30.42.50.01.001 Unworn Steel 42mm Manual winding
Omega Speedmaster Moonwatch Co-Axial Master Chronometer /...
R103 766
+ R3 052 for shipping
Professional dealer
4,92 (71)
DE
TAG Heuer Autavia WBE5190.FC8268 Very good Bronze 42mm Automatic South Africa, Paarl
TAG Heuer Autavia Chronometer
R48 043
Free shipping
Professional dealer
4,92 (32)
ZA
Rolex Datejust 41 126334 New Steel 41mm Automatic
Rolex Datejust 41 Blue Roman Dial (New 2022)
R248 490
+ R1 662 for shipping
Professional dealer
US
Omega Speedmaster Racing 326.30.40.50.03.001 Good Steel 40mm Automatic South Africa, Johannesburg
Omega Speedmaster Racing Chronograph, Black&Blue Dial,...
R59 999
Free shipping
Professional dealer
4,85 (269)
ZA
Rolex GMT-Master 1675 Good Steel 40mm Automatic
Rolex GMT-Master Pepsi 1675 Mark 3 Radial Dial Jubilee Serial...
R533 479
+ R12 452 for shipping
Professional dealer
4,94 (154)
DE
Breitling Montbrillant Légende A23340 Very good Steel 47mm Automatic South Africa, Johannesburg
Breitling Montbrillant Legende Ref.A23340, Box & Papers
R83 949
Free shipping
Professional dealer
4,95 (60)
ZA
Breitling Navitimer R23322 Very good Rose gold 42mm Automatic
Breitling Navitimer Limited Edition of 500 Pieces Rose Gold...
R203 192
+ R1 931 for shipping
Sold by Chrono24
UK
Omega Seamaster 300 233.30.41.21.01.001 Very good Steel 41mm Automatic
Omega Seamaster 300 Master Co-Axial Ref. 233.30.41.21.01.001 B&P
R89 814
+ R2 790 for shipping
Sold by Chrono24
DE
Rolex Datejust 41 126334 New Steel 41mm Automatic
Rolex Datejust 41mm 126334 Mint Green Dial Jubilee NEW 6/2022
R383 655
+ R5 214 for shipping
Professional dealer
5,00 (5)
DE
Rolex GMT-Master II 126710BLRO-0001 New Steel 40mm Automatic
Rolex Gmt-master II
R428 004
+ R2 138 for shipping
Professional dealer
4,95 (19)
HK
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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.