patekkie
1552
Which Amagnetic? There have been at least 5 Ref. Nos with that name; the 3410, the 3420...
the 3434, the 2570, and the 3417 SS version of the 2570.
The 27-400AM movement which powered all of the above may be the most beautiful HW wristwatch movement ever from Patek, and it was 'special' in this application in that it had a gold lever, to prevent magnetic interference. The 27-460 is very pretty too, don't get me wrong, but the classic look of the 27-400AM is my personal favorite.