Missleman......I just joined up here today (3/21/13), cause doing a google search on a shotgun I have, led me to this post.
Ironically, I see that you are from Omaha, and (me too). I was born and raised there and spent 35 years there. Back in those days, (late 60's as I recall), I purchased a used 10 gauge double from a local Locksmith Company run by a couple of Brothers......Can't recall the name.
Anyway, This is a Spanish double that says Du Bois Arms Co. Omaha, Nbr. on the barrel. It is a 3 1/2 10 gauge magnum. I'm interested in selling it, do you or others know what the value of it may be.