Mauser 420B small bore competition rifle from the mid 30th.
Here with a very unusal Ross 15X sight with outside adjustments.
It's mounted in period Parker Hale mounts.
I have not found any inofrmation about the Ross sight so far, and that is very strange indeed as the qualtiy of the optics is outstanding. some sources have told me it's made around the 30th and some before 1914. The optics are coated so that have probably been done much later.
