You can have a look at these references: In 1937: in some 499, not all versions, even the 533 Chronograph (chronographs don't have often a swiss mention at all) In 1938: in some 560, 565, 598, 556, the 591 Chronograph, 1420 In 1939: some 1435 Maybe the pi
It's a 17''' SAV (savonette) PS (petite seconde) caliber Has already been said the pocket watches which houses this caliber.. If you want to find the same antique and traditional design in a PP wrist movement, you have to look the 12-120 caliber... I thin