This is an authentic PATEK PHILIPPE 18K Yellow Gold Lizard 31mm Calatrava Mechanical Watch Black. This timepiece is crafted of 18 karat yellow gold with a black lizard strap. The watch features a mechanical hand-winding movement, gold dial, gold stick index hour markers, and polished gold hands. This is a superb watch with the classic elegance of Patek Philippe. Please note: The strap is not original to the timepiece. Follow this item for alerts. Patek Philippe is a registered trademark of Patek Philippe. FASHIONPHILE is not affiliated with Patek Philippe.