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And I would not really expect to find an 1940's , still with the factory crystal , after 75 years.....
Weren't a good number of watch crystals in the 1940s made from some variant of clear celluloid? Hence why a lot of watches have yellowed, almost wrinkly crystals.
Is there a way to determine if the crystal is the "correct" one for this model? Or even determine if it's an Omega?