In the PCGS Price Guide, it list 1999 through 2004 D & P coins as regular mint. In 2005 & up, it list D & P regular plus D & P Satin finish. What is the difference between the regular mint and the Satin finish mint ?
Before 2005 mint set coins are indistinguisable from regular circulation issue. They were struk under greater pressure and at slower speeds with new dies and then specially handled but you can't really know if it's a mint set coin or no from before 2005. In 2005 the mint set dies began recieving a chrome plating and it affects the appearance of the coin which the mint nicknamed "satin finish".
I recently found a 2004 with exact same chrome type plating and even more doubling type effect for the GREAT LAKES STATE.Would this be considered a US mint Error of some sort.Since they are suppose to be for 2005 and beyond.Did I find great fortune !
The "DIES" received the chrome plating not the planchets or coins. What you have here is simply a plated coin which is considered PMD (Post Minting Damage) which renders it worth only face value.