Just went through a few drawers:
DWM 2 digits on the inside bottom of the side plate: confirmed.
Mauser 2 digits on inside, some with 2 first numbers of serial, others with one higher, as reported.
Mauser 3-digit serial number: Only one digit on the inside (150b has a lone 1 on the inside).
Some oddball pistols with different lay-outs, including late war assemblies and a Portuguese contract.
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