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Patek Philippe. A fine 18K gold hunter case keyless lever chronograph watch
Patek Philippe. A fine 18K gold hunter case keyless lever chronograph watch

SIGNED PATEK, PHILIPPE & CIE, MOVEMENT NO. 156'570, CASE NO. 267'372, MANUFACTURED IN 1909

Details
Patek Philippe. A fine 18K gold hunter case keyless lever chronograph watch
Signed Patek, Philippe & Cie, movement no. 156'570, case no. 267'372, manufactured in 1909
Cal. 19''' nickel-finished jewelled lever movement, bimetallic compensation balance, cam wheel regulator, gold cuvette, white enamel dial, Breguet numerals, outer Arabic five minute and 1/5ths seconds divisions, subsidiary seconds, plain circular case, chronograph button in the band, case, cuvette, dial and movement signed
51 mm. diam.

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Lot Essay

With Patek Philippe Extract from the Archives confirming production of the present watch with enamel dial and Breguet numerals in 1909 and its subsequent sale on 6 November 1912.

Fresh to the market and in very good, original overall condition this chronograph watch is further distinguished by its movement featuring Adrien Philippe's precision regulator with fast/slow adjustment by an offset snail cam or cam wheel regulator, a standard requirement particularly also for the firm's "Gondolo" watches.

This precision regulator is the improved version of Philippe's invention patented in 1881 (French patent no. 142376). The characteristics of this invention are principally a disc, the surface with a groove in the shape of a spiral. This disk is placed in a concentric recess at the screw of a balance cock, and can move it freely under a rim implemented at the head of this balance cock. The second important piece is the regulator on the tail of which is a conical index-pin protruding below which engages in the disc's groove. The little cone of the index-pin must exert a degree of pressure on the groove as well as on the disc itself which is also held fast under this pressure.

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