I have a piece of trench art which my dad liberated in Germany in WWII. It is an ashtray made from a shell case which is 135mm in diameter and with a 140mm base diameter. The case says Patronenfabrik Karlsruhe on the bottom. Dad said lots of brass was flattened by tanks and other presses to create useful items. Question: What kind of weapon of war was this used in, and was it in use in WWI, WWII, or both???