A friend has an old Walther PP22 that he needs a magazine for. I told him I would try to research it and find a mag. Now I find that I don't know enough about this gun to help him. He describes it as a pre-1945 model PP22. He supplied the number 23992P, but I don't know if that is a serial number, or something else. If anyone out there can give me any additional info, or where I might find the correct mag, I would greatly appreciate it. Thank you!