Edgar Kiess, Drusselstrasse 33, Suhl, is documented 1899 to 1937. Though he specialised in bolt action rifles, as usual with the German gunmakers made or had made any gun a customer demanded. This gun was proofed by the Zella-Mehlis proofhouse (Nitro in script, 569 ledger number) in December 1936. So it was probably made for Kiess in Zella-Mehlis to the “in the white” state, merely finished by him.
The 8x65RS was developed by Wilhelm Brenneke, Leipzig, in 1912, some years before the 7x65R. Original ballistics show a 13.4g = 207gr TIG bullet at 2660fps.