Are "proof" coins ever in circulation? When the new quarters started, I bought one of those collector books. All my quarters are about as freshly circulated as you could get, but one quarter looked especially shiny. It is quite easy to notice.
Also someone once paid me (while at a register) with a dollar bill from 1957 which says "silver certificate" on the top. Anyone know anything about those?
I could google for it, but I figured since we were already on topic...
