Hey everyone. This is my first post. I just traded a shin gunto WWII Japanese sword for this beautiful Walther RZM PPK. All matching with original magazine. I know very little about the RZM history pertaining to this firearm. Is there a good resource that anyone recommends where I can learn more about the use, issue, quantity, etc. that we're manufactured under the RZM? Serial number is 823483. Thank you for this great forum and any advice!