What is it?

[Beginner]

Gentlemen,
Attached are some photos of the mystery gun - some may be repeats - apparently some phots were too "large" so I had to do one at a time
The "description" uploaded is a summary of my observations of the gun, and where possible, the gun was compared to photos in Gibson's book with page references, etc

Thank you for your input and you interest

Cordially Mike