Patek Philippe 866/12

Patek Philippe. A fine and possibly unique 18K gold and enamel openface keyless lever watch with enamel miniature "Guerre des Souabes" by M. Bischoff Signed Patek Philippe, Genève, ref. 866/12, movement no. 931'912, case no. 433'542, manufactured in 1971 Cal. 17'''170 nickel-finished lever movement stamped twice with the Geneva seal, 18 jewels, silvered matte dial, applied gold baton numerals, gold dauphine hands, subsidiary seconds, circular case, snap on back with a painted polychrome enamel miniature depicting "Guerre des Souabes" (Swabian War) signed Bischoff , case, dial and movement signed 47 mm. diam.