I acquired a few military items, and one is a silver cigarette case either WWI or WWII with mysterious hallmarks. I spent all afternoon on numerous sites trying to find something similar. It is engraved on the front LT. C.H. Gunn 356th INFT. which was an American unit in WWI but fell under th 86th in WWII.
It is hallmarked on the inside edge. And I assume I photo'd the correct way up, with the 900 designation at the end.
Any help or direction is appreciated.