In 2005 the U.S. Mint introduced a new Set of coins which had a special finish. These new coins were referred to as Satin Finish coins and came in Special Mint Sets. The coins did not go into circulation and were only sold to collectors by the U.S. Mint. The coins were better stuck than circulation strike coins.
The 2005-P Satin Finish Roosevelt Dime was no exception and was struck really well. Most examples range from MS67 to MS69 condition.