You will have to contact Walther
No such sn in the Walther convention
You will need to contact Walther to find out.
1961
No such serial number in the PPK/S range.
Dieter Marschall's book on Walther has sn data in it.
Try asking on the p38forum.com
Try the P38forum
Someone at the p38forum.com will probably be able to help you.
Someone at the P38forum.com should be able to help
Someone at P38forum.com might be able to assist you.
Might be listed in Dieter H Marschall's book.