Sorry to dredge this up from so long ago, but some of the fellows are still around. The scope on the model 54 in the NRA museum link above is a Rudolph Noske scope. They were made with enough eye relief to sit forward of the bolt handle. Noske made scopes beginning in the 30s and into the 40s. Latest ad I saw was in a Field and Stream from 1947. 2.5 and 4X. They were nice little 7/8" tubed scopes, the Army even tried them out in the late 30s. But Noske was a German, no wartime contracts came his way. O'Conner and Elmer Keith wrote about the Noske scopes. Like O'Conner I feel it was a better scope than either the Alaskan or Texan. The objective lens is adjustable, and even though I can no longer see a front sight with my right eye, I can adjust the focus of the Noske so that I can see without glasses. One now deceased writer/researcher stated that the last of the Noske scopes were liquidated via Stoegers in 1954. I bought a 54 Stoegers, couldn't find any mention of the liquidation. Both Bob Bell and Nick Stroebel said that Noske quit during the war, but the 1947 ad mentioned above says otherwise. I did read somewhere that he'd said he was having trouble getting aluminum tubing during the war. He had obtained a patent on a prismatic scope during the war and called it Noske's Little Imp. I think he was leaning toward developing that and getting away from the tube scopes. The Boone and Saturn scopes are similar, but use mirrors in the place of the prism. He may have been working with Tinsley labs on that, he died in 1958 at the age of 83. I have one of the 2.5x Hunter models. The elevation adjustment is graduated for a 173gr bullet at 2700fps. I used it once in a 88rd match on my K31. I must've bumped the windage adjustment a bit and was throwing some misses, but dialed it back in and finished up with a good string of 10s from 300yds on the 600yd reduced for 300 target.