Dieter Marschall's book might have the answer.
I have a Walther PPK 9mm Kurtz pistol with an eagle over crown mark. I believe your shotgun must be German.
The PPK/s is a PP with a PPK slide.
The Walther PPK pistol is manufactured by German small arms maker Carl Walther GmbH.
The Walther PPK pistol was first released in 1931. During that time the Walther PPK pistol was popular amongst European police and civilians because it was reliable and concealable.
Someone over on the P38forum.com, in the PPK sub forum, might have access to the sn data.
You will have to contact Walther for the exact date.
You will have to contact Walther
.380 or 32
No published sn data for Interarms PPK
Made in 1939.
Yes, 7.65x17mm is the same as .32 ACP. So a Walther PPK chambered in 7.65mm will take both.