(57053) Patek Philippe Perpetual Calendar Chronograph, 5970J, 5970 J, 5970, the yellow gold variant of the 5970 is by far the rarest of the entire series and was produced in the smallest quantity, yellow gold case is in excellent condition, original yellow gold deployant buckle, manual wind Lemania-based Patek Philippe Caliber CHR 27-70 Q, chronograph, perpetual calendar (day, date, month, leap year), moon phase, AM/PM indicator, s...