Welcome to the Forums G. You have what appears to be a commercial issue PP that was made during WWII (although with the pitting this is hard to tell). I believe it is commercial because I do not see any military acceptance stamps on the weapon.
I'd suggest you field strip it and clean it thoroughly with Ballistol to prevent more damage. You might also want a smith to look it over before you decide to shoot it.
Field stripping is no problem. I’ve owned a couple of PPK/Ss. The chrome trigger guard and chrome safety puzzle me. Also there are no markings on the slide. I’ve got a dig up my can of Kroil oil as the safety is frozen.First of all make sure it is not loaded. As shown the safety is set to fire and the hammer is cocked. Make sure the chamber is empty. Rotating the safety down will decock the hammer. Place your thumb on it first to slow the fall. If you don't know how to field strip we will be glad to walk you through it.
Good find...I looked all over my basement and didn't find anything but someone's dog's ashes in a tube. Wanna swap? 1917