Importantes Montres de Collection

Geneva, May 15, 2011

LOT 450

Patek Philippe - Extra Adjusted for Observa tory Trial & Power Reserve Patek Philippe & Cie, Geneva, Switzerland, No. 170345, case No. 406150. Made circa 1915. Very fine and rare, 18K gold keyless pocket lever chronometer with "Extra" quality movement made for Observatory Trial, power-reserve and Guillaume balance. Accompanied by an Extract from the Archives.

CHF 15,000 - 20,000

USD 16,000 - 22,000 / EUR 11,000 - 15,000

Sold: CHF 18,750

C. Four-body, "bassine", polished, hinged back with engraved monogram, demi-concealed hinge. Hinged gold cuvette with engraved presentation inscription. D. White enamel, black Paris numerals, outer minute track and red Arabic five minute numerals, subsidiary seconds with red numerals, power reserve sector below 12 with red numerals. Blued steel fancy hands. M. 42 mm (19'''), "Extra", fausses cotes decoration, wolf's tooth winding geared to an extra wheel operating the power reserve indicator, special mainspring ratchet wheel click preventing overwinding, 21 jewels, counterpoised straight line lever escapement, Guillaume balance with gold and platinum screws, eight adjustments, blued steel Breguet balance spring with terminal curve, swan-neck micrometer regulator, diamond endstone. Dial, case, cuvette, and movement signed, movement numbered twice. Diam. 50 mm.


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Grading System
Grade: AAA

Excellent
Case: 3

Good
Movement: 2*

Very good

Overhaul recommended, at buyer's expense
Dial: 3-01

Good

HANDS Original

Notes

The movement of this watch has the unusual winding click only found on a very small number of Patek Philippe watches made for Observatory trial. When destined for Observatory Timing Contests, the movements of Patek Philippe watches, like those of other makers, were double engraved with the movement serial numbers. The inscription "Extra" on the bridge of the movement refers to the high finishing of all the parts of the movement.