Beautiful watch, thank you for sharing,
This is a Patek ref 2526, a timeless classic sought after by vintage Patek collectors.
The watch is Patek's first auto ref and uses their very first and celebrated automatic movement, the superbly finished 12-600AT, with solid 18k rotor. Other highlights on the 2526 are an enamel dial, and double P crown which make it so distinctive and handsome.
All the best!
Rishad