mikedunn
121
Huber's book
Huber and Banbery's book "Patek Philippe" is going to tell you the ref 2406 used the 12"120 and 12"400 (12SC)movement and production commenced in 1945 and this is a round watch. No photos in the book of this particular reference. To repeat, it is a lovely watch, a classic but it is not a giant in Patek's history.