Patek Philippe Perpetual Calendar new old stock. The 18K yellow gold case is 36mm in diameter. rare Roman numerals and black Alpha hands indicating hours, minutes, day, date, month, leap year, 24-hour AM/PM hand, and moon phase. The self-winding micro-rotor Patek Philippe caliber 240Q is visible through the sapphire case back. Black strap with deployant buckle. This timepiece comes with winding box, solid case back, setting pin, Certificate of Origin, and booklet.