1964 Washington Quarter "PCI PR70 DCAM" "Proof 70" "Proof" PR indicates that the coin is a special strike made for collectors with a highly polished finish, distinct from regular circulation strikes. The "70" is the highest grade on the Sheldon Scale (From 1 to 70) Indicating a coin with no visible flaws even under magnification. DCAM stands for "Deep Cameo" These coins almost never come up. $200