The case number is still stamped on the inside of the case back. This is not the full part number you need to order a replacement case, but it's enough to get you started finding parts.
For example I just removed the case back off a watch that I have here for repairs - ref. 25418000 Seamaster Quartz model. Inside the case back the number is 196 1523. The full part number for a complete case is 055SU1961523.
Cheers, Al
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