Case material: Yellow gold; Charge: Automatic; Conditions: Used Presentation condition : Without documents; Model: Grand Complications Perpetual Price on request Gmtbroker Reference: 3940J-014 Pristine preowned mens Patek Philippe complication features perpetual calendar functions and phases of the moon. Comes with its original box and papers. That includes its open stamped Certificate of Origin,  folder and booklets, and winding box as well as its solid back and stylus. Patek black exotic strap with Patek 18k yellow gold deployant buckle.