Someone on the P38forum.com might have access to that kind of data.
plenty of difference the ppks is a shortened version of the walther pp - it is not a ppk - thanks to stupid govt regulations
The PPK/s is a PP with a PPK slide.
1969-1984
100-1000 USD depending on specifics
no published sn data.
100-1000 without more information.
You might have better luck on P38forum.com
Anywhere from 100 to multiple thousnands of USD
100-1000 or so
It's not designed to do so. (No.)
No such serial number in the PPK/S range.
Take it to a professional who specializes in air weapons.