Need Help To ID These Vintage 3 Point Sights

[OldYooper]

The Sight on the Left in first Pictures has B. & M. stamped
on it. The other on the right has not markings.

The other pictures 3-4-5 have dove tails with a
screw to hold them in place no marking.

Any help would be appreciated. OldYooper.
Thanks for looking.

 

[Kp321]

Picture one is of scope rings for externally adjusted scopes such as Lyman Super Targetspot or similar. Picture four is of bases for for these rings. B&M could be Belding & Mull but I wasn't aware they made scope mounts. I know the name from their powder measures.

 

[2152hq]

They made both scopes and mounts (like these) and had separate catalogs for them in the 30's.