The attached picture is from the October 43 edition of TM 9-2200 which was a sort of catalog of small arms and accessories from .22 to 20MM. As far as i have been able to determine it is the only official picture showing an Alaskan (M73) on an M1903A4. Right about the time that manual was published the word came down that the long awaited Alaskans were not going to happen at least in time for the A4.
A couple of points:
The Redfield base used on the A4 has a bevel at the rear. The purpose of the bevel is IMO to provide clearance for the Alaskan eyepiece. The bevel serves no purpose with the Weaver 330C (M73B1) as the scope cannot be mounted far enough forward for clearance to be an issue.
Eye relief is optimized with the scope mounted in the forward position.
GI manuals are generally pretty good but not perfect, Note in the attached picture there is a mix up in the captions.
Regards,
Jim