I think the 1971 dollar still contains partial silver. up to 1974 if I remember correctly. same with halves. you can take it to any gold and silver place and get i think 5 times face for it if i'm right.
speaking of all this... anyone know anything about value of wheat pennies? I have about 25 rolls of them that have been collected over the years. they are unsearched (not that i'd even know what I'm looking for) and in various different conditions but there are a lot of really early ones.
Except for proof sets and special coins, 1964 is the cut off for silver in US coins.