This one sounds having clear provenance.
Back a while ago, I saw the pictures of a Broomhandle Small Ring prototype (a "1912" like gun) in another forum. The gun was known even from Belford days (1960s). No gun blue, no serial number either. I was very surprised to hear it has some blue inside the frame (!!) Owner was not happy when I raised question mark, so I stopped there.
Looks like no theory works except provenance in the prototype world.
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