Patek Philippe Perpetual Chronograph Yellow Gold 36mm Case 3970E This watch is Previously Enjoyed and comes complete with its original Patek Philippe packaging, manuals and certificate of origin. This watch is circa 1986. This watch has its original Patek Philippe tang buckle along with recent addition of the Calatrava yellow gold folding clasp and alligator strap by Patek Philippe. This watch is in excellent running order. The watch comes with its additional solid case back and stylus.