The American Innovation $1 Coin Proof Set™ features four stunning coins with sharp relief and a mirror-like background with frosted foregrounds, giving them a special cameo effect with reverse (tails) designs emblematic of the following State’s innovation or innovators: Ohio — Underground Railroad Louisiana — Higgins Boat Indiana — Automotive Industry Mississippi — First Human Lung Transplant Minted at the U.S. Mint at San Francisco. Mintage Limit: 80,055 Product Limit: 80,055
