Gold Swiss split chronograph watch with register Circa 1967

Rare gold open faced split chronograph watch with register
–
A rare 18k yellow gold open-faced split chronograph watch with register, circa 1967, cal. 17” damascened nickel lever movement, 29 jewels.
Silvered dial, applied baton indexes, subsidiary dials for constant seconds and 30-minute register, outer track calibrated for chronograph, polished and satin-finished case, stepped bezel, case back with engraved initials, case, dial and movement signed, Extract from the Archives confirming sale in 1967.
–
Diameter: 49.5 mm
–
Signed: Patek Philippe