The attached photo is the "Gun belonging to Lawrence Nuesslein (USA), two-time Olympic shooting champion, Antwerp 1920."

I wasn't allowed to see what was in the attached cloth bag.

Anyone know what sight that thing has on it? My kinda rifle, thanks for showing us this one.

Thank you. I know so little about some things- like BSA sights. Good to have my body of tutors here for questions like that one. You guys are tops. 
I think the bag is for jelly beans to eat while waiting for the others  to finish shooting.

Here's a close-up of a BSA #8 mounted on a BSA adapter plate to suit a Highwall. This one was fitted to a .38/56. The yellow glass element on the eye piece really sharpens the sight picture.

That's a great Highwall in the museum. What cartridge was it chambered for?
Pete

QuestionableMaynard8130 wrote on Jan 24^th, 2017 at 7:23pm:


Maybe curious too? I am also!

If it isn't for mounting the display, it's just gotta be one of the now-outlawed bellybutton rests in its folded position. Rare accessory sold by Harry Pope in his later years.

watchthewind wrote on Jan 24^th, 2017 at 11:23pm:


Maybe the gold that he won

Frank

The when they went with the Springfield arsenal rebarrelled and rechambered Hammereli-Martini striker actions. 
  Fascinating period that is largely overlooked in our single shot "schuetzen" and "Buffalo hunter" dominated orientation.  I'm guessing it was a bit too narrow focussed with only a small group of active shooters made up of military teams and an even smaller group of civilians.  300 meter only matches were just too specialized for mass appeal.


Re the "belly-button rest""  After looking at it a whole lot more, and trying to make sense of the rather confusing exhibit technique; I've concluded that it is a museum fixture to support and stabilize a rifle with a pronged buttplate in a vertical position with the flat side oriented to the glass.   I'm speculating that there is a plug on the bottom that engages the sockets visible in the exhibit case floor and that it is attached to the grip-cap area with one of the museum archival-quality adhesive pads that will leave no residue when removed properly.  By supporting the arm with the fixtures the longer lower butt-plate prong and some sort of barrel or forend support the rifle can be exhibited solidly and securely. 
  Having been a museum-director in my past life I know the exhibiting in a vertical format exhibit case can be a real difficult PITA to do. {I wish I had access to that system when I was designing exhibits} 
 While distracting as it appear in the photo it appears to be a very good solution and if other long guns in the exhibit use the same technique it would not be as distracting as it is when isolated in a close up photo. 

No idea what's in the bag, maybe added sight accessories?
but since its in Switzerland I'd hazard it's chocolates rather than jelly-beans