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Made about 1935
You will have to contact Walther
Early 1940s
No such serial number in the PPK/S range.
Might be listed in Dieter H Marschall's book.
Dieter Marschall's book might have some information. If not, try the p38forum.com
Yes, you can often determine the production date of a Walther PPK by its serial number, but the method varies depending on the specific model and manufacturer year. For example, Walther produced the PPK from the 1930s onward, and different production runs have different serial number ranges. Reference guides and databases specific to Walther firearms can help decode the serial number for an approximate date. However, for precise dating, consulting with a firearm expert or historian is recommended.
Impossible to answer without the serial number.
1938
You will need to contact Walther to find out.
1931 to date
The PPK/s is a PP with a PPK slide.
You need to find a copy of Dieter Marschall's book on Walther handguns.