Patek Philippe 3512J Calatrava Extra Thin 31 mm Circa 1967
- Watch Specifications -
3512: Patek Philippe launched the reference 3512 in 1964 and it was in production until circa 1977. The cases for this model were made by Antoine Gerlach and are only 5mm thick. Patek Philippe advertised this watch as their "classic extra flat watch." This model came in many variations.