Unknown custom in .270, although highly suspected the metal work is Griffin & Howe based on their jeweling pattern and a complex 5 panel bolt knob.
just had G&H custom fabricate 30mm rings with a custom offset (pricey!) so I could use it with a modern 2-10x50 Leica. The original Lyman aperture can now rest on the rifle simultaneously with the optic. (It previously had a 1” optic in low configuration)
