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I'm guessing, that like all Grandfathers, the bracelet is a Speidel Fixoflex.
I will try to do some photoshop magic on the picture to possible make it easier to identify.
Will post it here later.
That would be fantastic...
Do you have it in a digital form or did you use your phone to take a picture of the original?
Can you take another one that is a close up of the watch?
unfortunately I can't really do much with the one you posted here.