Patek Philippe 3634J; 18 Karat yellow gold Automatic winding Ellipse with a black onyx hard stone dial.
The watch was made in 1977 and is fitted with a 28-255 caliber automatic movement #1287658 / Case #539377.  The watch measures 38 x 33.5mm with a triple step fluted bezel.  The watch is accompanied with its original factory Swiss black lizard strap and 18K yellow gold Patek buckle.
Further accompanied with its original Patek box.