Wayne-I am in the same boat as you with a pretty fine Reading gun that has no signature. Here is a reasonable solution to our mutual situation. There is a descendent of Wolfgang Haga living in NE New Mexico; Mel Haga (he pronounces it Hey gah), who is an old rancher, now in his 80s. I'll meet you in Santa Fe, with rifles, and we can go up to his place and have him sign both of them. And just like that: two signed Haga rifles! Okay, it probably isn't too moral or practical, but it would fill in some gaps in the record.
Dick