This just received from PhysDoc:
"I think, and I am pretty sure on this, that the sight on that 1903 is, according to Nick Stroebel's book, a Marble-Goss Super Springfiield No. 7 Sight
Designed specifically for the Springfield Model 1903 rifle, this sight was mounted in the magazine cutoff, without any modification to the gun being necessary. It featured a quick detachable elevation staff. 1/4 minute "hand-lapped thread" click adjustments and a reversible disc carriage for choice of an iron or telescopic height sight picture. Value: $150-$275"
I suspect this sight was designed with target shooters in mind, who wanted to use their NM Springfields as match rifles in appropriate matches, without altering them permanently by drilling and tapping for a Lyman 48.
The alterations to the action were characteristics of Wundhammer's Springfields. I wonder if there is a small checkered area on the underside of the bolt handle, another of his characteristics. Somebody may have found a diamond in the rough.
