I found a '72 Doubled Die cent in 1987. My brother found a 1921S buffalo nickel in a roll. I still have it. Grades Fine with a full sharp date and about 1/2 horn on the buffalo, but has a scratch by "Liberty" that would probably give it a net grade if I sent it in. Those are my best keys.
I have found a few less common dates: 1918d buffalo, 1995 Doubled die, 1970S small date cent, 1960 small date cent, 1950D and 1939D Jeffs. And about 360 ounces of silver.