J.P. Sauer & Sohn 38H WW2 Model Information?

Since this is an old gun and I really haven't done much with it I would love to know what kind of cartridge this gun fires. I believe it fires a .32 ACP round but would love to know for sure in case I ever get around to shooting it I can have some spare ammo laying around. The gun is in really rough shape so I really cant see any of the serial info on it and just by luck and a few hours of research is how I found out that I owned a Nazi pistol lol so please no rude negativity because it took alot to even find out what it was. I think the gun is covered in some kind of paint so all the vitals are covered. Thanks again in advance!