With Patek Philippe Extract from the Archives confirming production of the present watch with leather strap in 1971 and its subsequent sale on 2 April 1973.
This reference 3445 is fitted with an additional glazed display screw back, custom-made by the actual owner, allowing him to admire the state-of-the art automatic movement. To the best of our knowledge it has never been offered in public before.
Reference 3445 is the first simple calendar wristwatch ever produced by Patek Philippe. In production for 20 years from 1961 to 1981 in the three gold colors and in platinum, it is furthermore an automatic and water-resistant timepiece.