Heard from the seller, mount screwheads not smoothed over so mount was not installed by G&H. A definite minus. Bore X. Will send a photo of the open buttplate, I will post it or if I can't will ask Mike to. 1" rings so mount is postwar - there were no 1" prewar scopes that I can recall. Weavers were 3/4", Alaskans and Noskes and small Euros were 22mm/7/8", big Euros were 26mm or larger. There were a very few Unertl hunting scopes prewar but I think they were 7/8".