Swiss lever with enamel miniature by M. Bischoff Circa 1971

Possibly unique gold and enamel open faced keyless lever by Patek Philippe
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A fine and possibly unique Swiss 18 carat gold and enamel open faced keyless lever watch with enamel miniature Guerre des Souabes by M. Bischoff, circa 1971. Nickel finished lever movement stamped twice with the Geneva seal, 18 jewels. Silvered matte dial, applied gold baton numerals, gold dauphine hands and subsidiary seconds. Snap on back with a painted polychrome enamel miniature depicting Guerre des Souabes (Swabian War) signed Bischoff. Case, dial and movement signed, case and movement numbered.
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Diameter: 47 mm
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Signed: Patek Philippe Genève