All, thank you again for your comments.

9,3x57 - I do not have much information about this rifle's history and the only things I can share are:
- It was not a German "left-behind" in France as German Forces crossed the Rhine River back into Germany in 1944 and 1945 in good battle order; in addition I am not sure that there would have been many commercial Mausers among the "left-behind" on other battle fronts.
- I bought this rifle from the Holt's Auction House (UK) at an auction in 2017.
- How she came to the UK I can't tell as she doesn't bear any British proof marks, only German BUGN ones from the 1934-1940 period.

Louis