The .375 H&H is a standout among model 70s, bearing several features which are unique to the chambering. These included a 25" barrel with a distinctive contour, and a dual-folding leaf rear sight.
This is a Winchester 70B, which appeared in 1953 and was used through 1963. It will only fit rifles with the 25" C1 contour barrel.
The post-64 Winchester 70B sight has slight differences, but will mount to the factory pre-64 barrel holes. Screws are not included with this sight.
The hole spacing is 1.25".