Help to I.D. old shot gun. (Pic heavy) Proof mark photos added.

[marshall]

The chamber length is 2.75 inches, the bore is not pitted, and mostly shiney.
The firing pins are operational. The wood is an excellent grade, but I'm afraid to clean it.
Thanks for the input.
What about restoring this old girl?

This looks like it would be worth the time to do.
2 3/4" camber? -overall or/ I will bet it is 2 1/2"
For the wood, Take a little paint thiner, ro turp. and give it a good scrub
with a dampened cloth and the dry it good.
MS stocking in Leader Sask. would do a nice resto on this.