Here is an image of my Type B in 7x57 showing where wood appears to have been removed under the bolt stop. I think a Lyman 35 (or similar sight) was once there. The rifle was bought new at VL&D in New York in 1909 according to records provided by Griffin & Howe.

http://i583.photobucket.com/albums/ss275/netcurrentassetvalue/IMG_1164.jpg