Hmmm... Hard one, all look so nice but if I had to pick one I would guess the marked one.
Im in no way an Pam expert, but the size and position of L and swiss and size, depth of cut-out of the numbers on the dial, clean edges of the strap I hope I picked the right one
If not, well either are all reps and that one got an exceptional dial or pam´s are truly awesome for their quality or the third option I know waay to little to be able to pick the flaws!!!
Awesome collection and lovely picture.
/J