I've been buying similar stuff from WW2. I have a nice cigar humidore made from two 105mm shell casings. The top of the humidore is the base of a 105 case that has been turned down to fit inside the mouth of another shortened 105 case. I have several ashtrays, one of which is engraved "Bouganville - Empress Augusta Bay - Nov. 1943". I have seen an ashtray that was made from a 105 shell that was presented to General Vandegrift by a Marine Artillery unit. It was marked "First Round Fired Against The Japs on Guadalcanal". I haven't been able to buy that one yet, but I'm still trying.