Patek Philippe World Time 605

Patek Philippe. A very rare and attractive 18K gold openface World Time keyless lever watch with black dial Signed Patek Philippe, Genève, ref. 605, movement no. 931'110, case no. 2'622'959, movement made in 1951, completed and encased in 1963 Cal. 17'''170 HU mechanical movement, 18 jewels, black dial, applied gold baton numerals, pierced stylised gold hands, outer silvered ring with the names of 39 world locations, all centred by a revolving grey and white ring calibrated for the Arabic diurnal and nocturnal 24 hours, circular plain case, milled bezel, snap on back, case, dial and movement signed 44 mm. diam.