I didn't mention, there was a William F. Mosby in Butte, MT around 1890. He was co-founder of the M & M Bar, a somewhat famous establishment in Butte. Can't believe there were at least 2 William Mosby's in MT at that time. Here's a link to an article about the M & M.
Mosby sold his share of the M & M in the early 1890's, can't find where he went. I think I saw where he came to Montana from Oregon (which is where my William H. Mosby also came to MT from, wierd)but, he probably wasn't borm in Oregon.