I assume you have found a token that is copper and the size of a US Cent. These were included in uncirculated mint sets in several years when there were only 5 denominations minted (no dollar coins) to fill the sixth space in the package. They have no numismatic value and are usually found in dealers' "junk boxes" for 10-25 cents.
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According to USA Coin Book, Philadelphia, Denver and San Francisco Mint each came out with their own Mint Sets. As of 2010, each set is worth about $5.50.
This coin in Good condition is worth about $0.45. A coin in Uncirculated or Brilliant Uncirculated (MS60 and MS65) is worth between $14 and $28
About $40
If it's truly uncirculated, it could be worth upwards of a dollar. It's hardly a rare coin.
Current retail values for this coin are $15.00 for the uncirculated coin and $20.00 for the proof coin