Dwight,
Good eye on the breech block. it does appear to be a double strike of the stamp. I doubted the first picture, and took it apart again. Here is a second photo.
You have me scratching my head about the "thumbnail" part of the frame though? I'd be happy to inspect or photograph whatever piece you're describing?
And a NO on the witness mark for the barrel, and a slightly better pic.
Pete,
This was the best I could do for the pic of the tool.
Under a bright light and magnification - I see an eagle/05 , then sometimes eagle/03. Maybe photo enhancemet will make it more clear?
Regards,
Fritz.