I am no expert but I see 4 different models of rifles. Two standard No4T's with the Lyman Alaskan scopes. One experimental lightened? rifle with is it the No32 Mk4? experimental scope and the last one is a bog standard No4T with "pistol" grip butt and the "experimental" scope.
I am with BIndi on this one, the experts need to chime in on this bit of evidence.
Great picture of some history!!
Cheers
Ned