I doubt its a Mauser. When the OP says "308" I think he transposed the numbers and meant 380. While the CZ 38 is a good guess, I bet its a CZ 24 which was made in much larger numbers (assuming that the gun is CZ at all
) .380 wasn't exactly popular back then in Europe, at least not to the extent that 32 acp was.
The CZ 24 is top left in this family photo. My newest CZ is a CZ 38