Photos?

'Oesterr. Waffenfabr. - Ges. Steyr', short for Österreichische Waffenfabriks-Gesellschaft Steyr (Austrian Arms-Manufacturing Company - Steyr), was marked on the left side of the receiver of all Mannlicher Schönauer rifles and stutzen until sometime in 1926 when the company name was changed to Steyr-Werke AG.

When was it proofed? Look for numbers such as these:

The above example was proofed in 1907, the 711th arm proofed at the Vienna Proof House for that year. The stylized 'NPv' is the 'Nitro Proof' for Vienna. The 'C 9.0' indicates a 9mm bore, which would be the original chambering (9X56) for the M1905.