Rpeck, your rifle was certainly made for export either to the USA or Canada, as the Words “Steel” and “Prussia” are English. Before WW1 such M88 actioned hunting rifles were often exported to America, where they were commonly called “Haenel Mannlichers” after the best known Suhl maker. Known V.C.Schilling representatives in the USA were Pacific Arms Corporation, San Francisco and Schoverling, Daly & Gales, New York.

As the gauge number 172,28 shows, your rifle was proofed in Suhl before April 1912. 172.28 stands for a bore/land (NOT groove or bullet!) diameter between 7.62 – 7.87mm = .300 - .310”, correct for an 8mmI, .318” bullet, barrel. The CROWN-crown/N marks show it was proofed using the special smokeless “4000 atm proof powder”after the special 1893 proof rule. It was proofed for a service charge of 2.67 gramm GewehrBlättchenPulver/StahlmantelGeschoss = 41.2 gr (military)rifle flake powder and a steel jacketed bullet. The other marks under the barrel are factory internal marks. The SS may stand for a barrelmaker(maybe Stephan Schilling?) who supplied both Schilling and Haenel with the half-octagon ribbed sporter barrels to fit the M88 actions.