Unique Swiss lever watch with enamel miniature Circa 1975

Gold and enamel open faced lever by Patek Philippe
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A fine and unique Swiss 18 carat gold open faced keyless lever watch with miniature after Van de Welde by Mrs. Bischoff, circa 1975. Mechanical movement double stamped with the Geneva Seal, 18 jewels. White matte dial with Roman numerals and subsidiary seconds. Snap on case back with polychrome enamel miniature depicting Le Coup de Canon. Dial signed, case and movement signed and numbered.
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Diameter: 47 mm
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Signed: Patek Philippe Genève