Patek Philippe. A fine 18K gold self-winding perpetual calendar wristwatch with phases of the moon

Patek Philippe. A fine 18K gold self-winding perpetual calendar wristwatch with phases of the moon
Signed Patek Philippe, Genève, movement no. 770'434, case no. 2'831'465, ref. 3940, manufactured in 1987
Cal. 240 Q nickel-finished lever movement stamped with the Geneva seal, 27 jewels, Gyromax balance, free sprung regulator, 22K gold micro-rotor, the silvered matt dial with applied baton numerals, gold dauphine hands, three subsidiary dials indicating day combined with 24 hour display, month combined with leap year indicator, phases of the moon combined with date, the circular case with stepped bezel, snap on back, downturned lugs, together with an 18K gold Patek Philippe buckle, case, dial and movement signed
36 mm. diam.