35 mm. Diameter
Patek Philippe introduced the reference 3445 in 1961 as their first simple calendar wristwatch in a series, which was additionally automatic and waterproof. It was produced in several configurations with and without lugs, silvered, champagne and blue dials, as well as with diamond numerals. The two piece Antoine Gerlach case was made in yellow, white and pink gold as well as platinum.
The present example is the reference 3445/6, which designates the watch is with an integral bracelet and preserved in excellent condition.