2008 S US Mint Presidential $1 Coin Proof Set OGP 2008 US Mint Presidential $1 Coin Proof Set Complete Original US Mint packaging including Certificate of Authenticity Contains 4 coins in stunning proof condition, displayed in one protected lense Each of these 2008-dated coins bears the "S" mint mark of the United States Mint at San Francisco This "vintage" Proof Set has been previously owned