I'm no expert, but I think all Arg. 1909 Mausers were mfg. by DWM. There was a Modelo 1909 Peruvian mfg. at Oberndorf, but I believe it was an intermediate action, large ring, small bbl. thread with a longer front ring and had the high clip hump and long cocking piece. The ring was marked Republica de Peru and Original Mauser. I've read of a small number of Oberndorf 8.15x46 target rifles, but I believe they were made in the 1930's and obviously weren't marked Modelo 1909.