I don't have a picture, but a pre-war, non-Transition, rifle will not be drilled and tapped on the rear bridge. Additionally, the rear bridge will be slotted for use with stripper clips. The bridge will have a trough running lengthwise with longitudinal grooves at the bottom.
When the factory began drilling and tapping the rear bridge of the Model 70, they changed the entire shape of the bridge eliminating the trough and the clip slot and producing the familiar shape that has been with the Model 70 ever since.
Frankly, I would never buy a Model 70 off the internet without comprehensive pictures of the rifle. With a pre-war, non-Transition rifle there will be four holes: two in the left-side of the rear bridge for a receiver sight and two in the front bridge. On a Transition or post-war action there will be six-holes, two in the rear bridge, two in the front, and two on the side.
Perhaps new designations are needed: "Pre-64 4-hole and Pre-64 6-hole"