I truly appreciate the information regarding hammer replacements though I likely won't be keeping any of these guns. Well, maybe one for a wall-hanging conversation piece.

My grandfather was given many firearms over the years as forms of payment. He was a business owner who never turned anyone away for lack of money. He accepted guns regardless of condition. He had a combination of hunting and military firearms. Most in so-so condition. I first saw this collection---more like a pile, really---over 30 years ago. Since that time they moved from garages to attics to closets. When my grandfather passed, a few of us took a memory or two and the rest languished in a closet for another 10 years or so. I've been dealing with the remainders and am now down to 7 that I hope to find homes for.

Looks also to have a gap between breech face and barrels also from the pictures. Would be a project gun for sure, but it certainly is an interesting action.
You mentioned a Grade 2 hammer also, got any pictures of it. I often carry a Grade 2 12 hammer gun for turkeys.