Patek Philippe Perpetual Calendar 3940J

A FINE YELLOW GOLD AUTOMATIC PERPETUAL CALENDAR WRISTWATCH WITH MOON-PHASES REF 3940J MVT 771897 CASE 2875003 MADE IN 1989 yellow gold diameter 36 mm , • cal. 240 Q automatic nickel lever movement, stamped with the seal of Geneva, 27 jewels, Gyromax balance, 22k gold micro-rotor • silvered dial, applied baton indexes, three subsidiary dials for day with 24-hour indication, moon phases with date, month with leap year • 18k yellow gold case, snap-on back • case, dial, and movement signed • with an 18k yellow gold Patek Philippe buckle