Want this question answered?
Dieter Marschall's book will get you in the ball park.
No such sn used by Walther.
@1944
70-85
pp pp pp pp pp pp pp pp pp pp pp pp
2 number date should be stamped on barrel at the ejection port.
You will need to contact Walther
@ late 70's
You will have to contact Walther to find out.
Dieter Marschalls book should have the answer.
Possibly late 30s
Roughly 1940-1945