In pocket change, the best I can think of is a 1946 plain penny in AU condition, and a Maryland clad proof quarter...I have found some silver, but not so much in change, but in teller trays and whatnot, so I count those as roll searches.
I had a 1909-"S" Indian Head cent like that once-- I firmly believed there I saw an "S where none actually existed.
I get an unusual amount of Wheat Cents in my change, (Sometimes 1 or 2 a week). Most of them are pretty "meh" though
We seem to be on a "foreign coin" streak with pocket change around here... Few weeks ago, the wife got this at the convenience store, in place of a quarter: And then last weekend, I got this at our yard sale, in place of a nickel:
My rarest change find so far was in 2009, I got a 1992 dated 10 kopyiok coin that was actually minted as a pattern in the Luhans'k Shell Factory for the proposed new coinage for Ukraine. This coin somehow slipped into circulation after 1996 when the new Ukrainian state coins were released.