Auction coming up. Never heard of this rifle.

[Badger]

Looks like a WWI GEW98 straight bolt sported cut back stock?

Maybe an early "Banner Mauser" model?

Sling hole on trigger guard is for early WW1 type sling....

I don't think that rear sight is military. Perhaps a hunting commercial sight?

I can't tell clearly from the pics, but the knox form area seems scrubbed of usual military manufacturer with year markings?

Interesting story and possibilities ....

Regards,
Badger