Hi Robert,
yes I would enjoy seeing the pictures,will show you the one I bought too,not cased like yours but neat adjustable cheekpiece.
As I am sure your know,the 6x5X55 was what the Swiss Mauser was chambered in so that would certainly be possible with the Geneva connection.
The info I have on mine,whihc was rebarreled with a Krupp in Kessel,is from a man in the M/S collectors Association.I will be happy to forward his email to you,perhaps he can help with yours as he was quite knowledgable.
Here is my email(the PM feature does not always work for me on here) dmkemp@mcttelecom.com

Hillary For Prison 2018