Just a note, a post like this would probably be more suited for a subreddit like r/whatisthisthing. I'm not saying that you won't have any success here, but you are more likely to find what it is over there. AskHistorians is more for, in my understanding, academic / scholarly discussions between people that can back up their statements with sources that are structured around questions the community asks. That wasn't a super great description, but it's the best I can think of at the moment. I hope this helps.

EDIT: See below for an excerpt of the subreddit rules on this topic:

"While we welcome questions about mysterious objects you may have found, you should also try asking about them in r/WhatIsThisThing. They have a much better track record!"