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Rolex Datejust 41
NEW 2023 Motif Green Dial Fluted Bezel Stainless Steel Jubilee Bracelet
S$22,801
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Rolex Datejust 41
NEW 2023 Mint Green Stick Dial Fluted Bezel - Stainless Steel Jubilee Bracelet
S$22,109
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Omega Constellation Double Eagle
Co-Axial Chronograph New Strap Top Condition Full Set Serviced
S$12,185
+ S$224 for shipping
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Rolex Submariner Date
41mm NEW/UNWORN
S$19,891
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Rolex Datejust 41
Grey Slate Wimbledon Green Roman Dial Oyster Bracelet 126334
S$20,043
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Omega Seamaster Railmaster
(Box and Papers warranty till Oct 2028)
S$3,600
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Rolex Sea-Dweller
Red 43mm 126600 Sea-Dweller 43
S$16,388
+ S$250 for shipping
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Rolex Submariner Date
41mm 126610LN Stainless Steel Unworn Warranty 2023 B&P
S$22,225
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Tudor North Flag
91210N-0001
S$3,800
+ S$130 for shipping
Rolex Submariner (No Date)
124060
S$16,750
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Rolex GMT-Master II
126720vtnr Sprite Left Handed _ Italian Full Set From 12/2023 _ New Stickers
S$31,396
+ S$268 for shipping
Omega Speedmaster
Full Set Speedmaster Dark Side Of The Moon Ref. 31192445101003 Ceramic
S$9,800
+ S$691 for shipping
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Rolex Datejust 41
"Wimbledon" | FullSet | 2019 | Weissgold
S$17,492
+ S$449 for shipping
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Rolex Datejust 41
18k White Gold & Steel Grey Slate Wimbledon Green Roman Dial Jubilee 126334
S$21,425
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Omega Seamaster Diver 300 M
2551.80.00
S$3,800
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Rolex Datejust 41
126334
S$19,166
+ S$349 for shipping
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Rolex GMT-Master II
LHD Sprite 126720VTNR Stainless Steel Unworn Warranty 2022 UK B&P
S$30,767
+ S$523 for shipping
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Rolex Sea-Dweller
ref 16660 - Very Rare Dial MK 3 Missing Hyphen & Cracked Spider - Full Service
S$59,803
+ S$342 for shipping
Rolex GMT-Master II
Sprite 8/2022 Like new
S$27,209
+ S$2,990 for shipping
Rolex Datejust 41
Azzurro Blue Fluted Bezel 2019
S$16,500
+ S$200 for shipping
Rolex Submariner (No Date)
124060
S$16,388
+ S$100 for shipping
Rolex Sea-Dweller
Y2021 Sea-Dweller Single Red SD43 Ref. 126600 Full Set
S$17,600
+ S$691 for shipping
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Rolex Datejust 41
18k White Gold & Steel Grey Slate Wimbledon Green Roman Dial Jubilee 126334
S$21,398
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Longines Spirit
L3.810.4.73.6
S$1,797
Excl. shipping
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Rolex Submariner Date
126610LN
S$20,482
+ S$349 for shipping
Rolex Submariner Date
41mm 126610LN Stainless Steel Warranty 2023 UK B&P
S$21,702
+ S$523 for shipping
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Omega Seamaster Diver 300 M
Medium 2551.80.00 Vintage - Chronometer Zertifikat
S$3,341
+ S$224 for shipping
Rolex Datejust 41
126334 Rhodium _ Full Set From 07/2017 _ Like New
S$17,642
+ S$268 for shipping
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Omega Speedmaster
Moonwatch Ref.311.93.44.51.04.002 Warrany Dated Feb 2017
S$9,966
+ S$183 for shipping
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Omega Seamaster Aqua Terra
Master Chronometer
S$8,018
+ S$148 for shipping

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Rolex Datejust 41
126334
S$17,926
+ S$298 for shipping
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Rolex Datejust 41
18k White Gold & Steel Dark Rhodium Diamond Dial Jubilee 126334
S$22,807
Free shipping
Omega Speedmaster
304.33.44.52.03.001
S$10,499
Excl. shipping
Private Seller

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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