This evening (EDT) I’d like to share with you one of this week’s finds. This trench art letter opener came out of the same garage as the Luftshutz helmet in my previous forum post. However I feel this piece predates the helmet by some time. I understand trench art letter openers are quite common however I am unfamiliar with the the markings on this shell and would appreciate any insight as to its age and origins!

Thank you!