Patek Philippe 866/58

Patek Philippe. A Fine and Unique 18k Gold Openface Keyless Lever Watch with Enamel Miniature After van de Welde, by Mrs. Bischoff Signed Patek Philippe, Geneve, Ref. 866/58, Movement No. 932'565, Case No. 433'676, Manufactured in 1975 Cal. 17-170 mechanical movement double stamped with the Geneva Seal, 18 jewels, white matte dial, Roman numerals, subsidiary seconds, circular case, snap on back with polychrome enamel miniature depicting Le Coup de Canon , case, dial and movement signed 47mm diam.