Thank you lancaster. The gun I'm looking at has the proofmark stamping and serial numbers on the frame, the ejection port is completely blank.

Interestingly, the proofmarks I have seen incorporate a number, such as yours whereas the Walther I'm considering has H1, not sure what that means.

EDIT: I have just found out that the PPK/S is not a handgun allowed in California. This is truly garbage!