BACK . Screw, steel .
It shows the S/N only .
MOVEMENT . AS 1130, no name .
PUNCHING . D. only .
Letter is larger (1,5mm) than numbers
S/N . 4 digits . The number of registered watches is small (5)
However , it is belived that a plausible range could be 12XX / 16XX .
NOTE . Range and S/Ns are purely indicative .
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