百達翡麗，不銹鋼橢圓形自動上弦腕錶，配中心秒針，型號3580

With Patek Philippe Extract from the Archives confirming production of the present watch in 1972 and its subsequent sale on 9 October 1972.
Reference 3580A was introduced into the market around 1972 and is the only stainless steel back-wound wristwatch ever made by Patek Philippe. Furthermore, the present reference 3580 is a perfect example of Patek Philippe's 1970's design.