There were no commemorative coins issued by the US Mint in 1981. Please examine your coin and then submit a new question with more information about the coin.
Your best bet is to find some books, and educate yourself. Try and learn as much as you can and have fun while you do it. Although, you can always take the easy route and just go toa coinshop and get...
July 24, 2009
The 1991 USO Commemorative was struck to honor the 50th anniversary of the United Service Organizations [USO]. The obverse [tails] side of the coin was designed by Robert Lamb of Rhode...
Mostly us coin worth a lot here coins below 1957 are worth at least 10 to 30 times the face value unless the coin has errors or is uncirculated.
There's simply no way to tell what a collection is...