Swiss 18 Carat pink gold open faced pocket watch Circa 1900

Gold pocket watch with Dauphine numerals by Patek Philippe & Cie
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A Swiss gold keyless winding pocket watch with open face, circa 1900.
Gilded brass movement, going barrel, straight line equilibrated lever escapement, cut bimetallic compensated balance with gold poising screws and blued steel hairspring with a terminal curve, index regulator with swan neck spring and precision regulating device for fast/slow using an eccentric snail. White enamel dial with revolving radial Dauphine numerals, outer minutes track with red five minutes numerals, subsidiary seconds at 6 o’clock, and original Louis XV style hands. Round shaped 18 Carat pink gold case, case back polished with engraved in taille douce (fine cut) the cypher M O D. Dial, case and movement signed and accompanied by the Extract from the Archives.
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Diameter: 46 mm
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Signed: Patek Philippe & Cie Genève
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The movement was also based on the Swiss invention patent No. 2 680, delivered on September 27 1890, to Patek, Philippe & Cie, Geneva, for a Remontoir avec mise à l’heure perfectionné (the definitive version of the keyless-winding and setting device), and, on the US design patent No. 20 483, delivered on January 13, 1891, to Adrien Philippe, Geneva, for a Watch bridges for Watch Movements.