Dieter Marschall's book has serial number data in it. Probably 1945.
You will need to contact Walther
You will need to contact Walther.
You will have to contact Walther to find out.
@1944
1938
You will can contact Walther, but probably 1943-45.
Impossible to answer without the serial number.
70-85
@ late 70's
Roughly 1940-1945
Possibly late 30s
Someone at P38forum.com might know.