It suggests it was made during the years when Austria, (where it would have been made in the great Steyr Works), was joined politically to Germany. So it would have been made, (or later mostly assembled from parts), just before or during the Second World War period. It certainly looks like a Mannlicher Schoenauer of this period.

If there are other proof marks, some hidden by the stock, this might help tell this rifles story further. Perhaps it will include the year. (The model number on the receiver, such as M1924, is not the year).

I've only seen one Mannlicher stamped, "Made in Germany" which was an 8x56 M.Sch. Model 1908. It came with a letter authenticating it's provenance, essentially brought back from Germany just after the war. Often the finish is a bit lacking due to war-time shortages and so on. This one looks fairly normal in the picture. It's a good calibre too!