Audemars Piguet. A fine 18K pink gold limited edition self-winding perpetual calendar wristwatch with phases of the moon

Audemars Piguet. A fine 18K pink gold limited edition self-winding perpetual calendar wristwatch with phases of the moon
Signed Audemars Piguet, Quantième Perpetuel Automatique, no. 18/50, movement no. 405'468, case no. D85349, manufactured in 1997
Cal. 2120/4 nickel-finished lever movement, 38 jewels, the pierced and engraved gilt rotor depicting the letters AP and with 21K gold rim, the white dial with Breguet numerals, three subsidiary dials indicating month combined with leap year, day and date, aperture for phases of the moon combined with lunar calendar, in circular case with hobnail pattern bezel, downturned lugs, glazed display snap on back, 18K pink gold Audemars Piguet buckle, case, dial and movement signed
36 mm. diam.