PF66 2006 Silver (Mint Error) Quarter NGC Certified. Shipped with USPS expedited delivery. This is a personal find that I submitted to NGC. The quarter is stamped on silver the same thickness as a half dollar. I included the photos from when I discovered the coin. (It calipers the same as a half dollar also!) It is flashy and has a lot going for it. Silver, Deep Cameo and most of all Proof Error!! NGC graded PF66 Mint Error! I have seen no others like it. Starting with a higher-priced amout but serious offers will be considered. Shipping and special packaging included.