My first guess was Conetrol, but the rear is odd. Maybe it is an older design? It is possible that the scope is to be mounted so low that they had no room for a post and machined the bottom of the ring itself to fit the base. I don't know if Beuler (sp?) ever did anything like this. I am not familiar with their stuff. Now you have my curiosity up. I hope someone chimes in that knows. Jeff
Beuhlers. Same as on my Lyman. 7/8" tube? Does yours seem to actually be about a 1 1/2 power? Mine is very clear and sharp but doesn't do much magnifying! Dot reticle in mine. Regards, Bill.