I am having a reunion with two cousins whose father served in both WWI (Pilot, 96th Bombardment Sqd.) and WWII (Corps of Engineers). In his belongings is a Luger, which they will bring to the reunion. How can we identify if it is from First or Second WW ? Do they use the same cartridge? Can they handle current loadings of currently available ammo? Uncle Geo was quite a story- Youngest American Pilot in WWI. Captured and escaped and recaptured in WWII, Captured "while hunting" in No Affrica.