Patek Philippe. A fine and unusual 18K white and yellow gold openface keyless lever dress watch with later dial

Patek Philippe. A fine and unusual 18K white and yellow gold openface keyless lever dress watch with later dial
Signed Patek Philippe & Cie., Genève, movement no. 187'870, case no. 285'442, manufactured in 1918
Cal. 19''' gilt-finished fully jewelled lever movement, bimetallic compensation balance, wolf's tooth winding, gold cuvette, the later silvered dial with finely engraved scroll and foliage decoration, inlaid blue enamel Arabic numerals, centred by inlaid blue enamel flame decoration, blued steel moon-style hands, flower-shaped blank subsidiary seconds dial, in circular case with finely engraved scroll and foliage decoration, applied white gold florets to the band, finely engraved pendant, trefoil-shaped two colour gold bow, white gold flower-shaped crown, together with an associated 18K white and yellow gold link chain, case, cuvette and movement signed
48 mm. diam.