It could be as little as 50 or up to 1000. It depends on EXACTLY what you have
You will have to contact Walther
No such sn in the Walther convention
You will need to contact Walther
You will need to contact Walther.
You will have to contact Walther to find out.
You will need to contact Walther to find out.
Impossible to answer without the serial number.
No such serial number in the PPK/S range.
Dieter Marschall's book on Walther has sn data in it.
You will can contact Walther, but probably 1943-45.
There are serial number tables that have been published.