Here are a couple of recent matchcovers I've acquired from small town Nevada. Had never heard of either so would guess they were slots only.

There's a Monty's Bar in Winnemucca listed in The Gaming Table, but no Monte's Bar. Either he advertised both ways, or there's an error in the listing. Do you know where the other spelling info came from, Allan?

My guess on age would be 40's on Monte's Bar, and maybe 60's on A-One Casino, just looking at condition and general design and construction.