Wow - a hundred quid just for finding your Model 75 rifle - now that has just got to get us all looking for it
I do hope our BBS members can find the rifle for you - I am sure they will let you know if they can find any information that could lead you to it - and the current owner will have a keen buyer too so it is a win-win situation.
Hopefully the rifle can be found and bought back at a fair price.