Rifle arrived and some observations.

Bore is a mirror.
Military pattern bottom metal is number matching.
S/N polished off bolt root when handle was modified but the "B & U" proof marks remain on the bottom. Firing pin, extractor, shroud and safety are matching.

The modification were done a long, long time ago.
The bedding compound seen next to the barrel and action(looks like Acraglas) is a "patch" for all the material that had flaked and fallen out. I cannot identify the material that was used to bed it originally.
Material is yellow in places, red, and brown in others.
Pad is a classic "Red Head".
Quick connect sling swivels are marked "King Pat. Pend." so not purchased out of the latest Brownells catalog.

Rear ring is not drilled and tapped. The barrel D&T. From the marks in the blacking, it was fitted with small bases for an externally adjustable scope.
I will probably install filler screws, but I do have bin drawer full of old bases and a couple of Litchert scopes. May mount one up.

For now though, it gets a place in the rack.