A Mannlicher 9.5x57 that may have been used by Osa rests in my rack. The rifle came to me 25 years ago via an old dealer who recollected that he acquired it from a relative of Martin or Osa's. This relative may have resided in the San Francisco bay area in the 60's or 70's.
It's a 1910 carbine with short barrel and otherwise normal stock lop.
My friend recalled that the relative also possessed a picture of Osa with the rifle and a lion and that it was in an old Stoegers catalog.
I intend to give the rifle to the museum one of these days if I can confirm Osa's ownership. You Martin and Osa aficionados, HELP!