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iEp-2331: Patek Philippe & Co. EXTRA Observatory Chronometer Swiss Pocket Watch

(Published date: 07/20/24)

Patek Philippe's Pinnacle

Observatory Chronometer "EXTRA"

A custom-designed base plate and bridges specifically for the "EXTRA"

A rare 21-jewel configuration with a hole jewel under the second wheel

The balance end stones are diamond on both the upper and lower sides

High-end barrel with a stop-work device

Wolf's teeth winding wheels

Anchor with a counterweight

The combination of the Guillaume balance and Breguet overcoil hairspring made of blued steel ensures minimal temperature compensation errors

Manufactured in the 1910s and subsequently entered into the 1913 Geneva Observatory Competition, achieving 24th place in the "Chronomètres 1re Classe, 3me Prix" category out of 159 entries

A chronometer database issued by A. Hidding is also included.

An exceptionally rare and remarkably substantial 18k solid gold case from Patek Philippe (total weight 123.7g)

The dial and movement are in flawless condition! Truly a top-tier machine, akin to "F1 specifications"!

Guaranteed practical accuracy: within 5 seconds per day


Item Information
Item NoiEp-2331
MakerPatek Philippe & Co.
Item NameEXTRA Observatory Chronometer Swiss Pocket Watch
Circac.1910
Serial153569
Jewels21 Jewels
WindingManual winding
SettingCrown setting
SizeCase diameter approx. 50mm Movement diameter approx. 41mm 
Case18k
DialEnamel
Item Price(ASK(eMail Only))
(Tax)-
Total Price(ASK(EMail Only))
Open sale07/20/24
StatusON SALE

Warranty

We guarantee our watches for 2 years.(Excluding man-made failures)


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