had two Super Grades 270"S
one had a prewar receiver Win. used up after WW2 to start commercial production, with no holes drilled in the top of action ring, but holes on top the rear ring.
i was told that the front mount used the back sight grove, maybe Seth mounts? memory weak on spelling.
other transitional model 1958 I BELIEVE. BUT IT HAD Griffin Howell side mounts alaskan all weather 4x, bought both from original owners one had box, and receipt from company store.<><DK
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