百達翡麗，18K金防磁腕錶，型號1578，1961年製 瑞郎5,000-8,000

With Patek Philippe Extract from the Archives confirming production of the present watch with calibre 27 AM 400 amagnetic movement in 1961 and its subsequent sale on 3 August 1961.

To the best of our knowledge, this watch has never been offered in public before and is furthermore only the tenth example of this reference fitted with the rare antimagnetic calibre 27 AM 400 to appear in public to date.

Reference 1578 was introduced to the market in 1943 and made in three series, the majority fitted with calibre 12-120 or 12-400 movements. A small series fitted with the antimagnetic calibre 27 AM 400 was produced between the late 1950s and mid-1960s.