Wallet Card with a propeller from the SS United States

That strange object in the back of a West Side parking lot is a propeller from the SS United States. Built in 1951, the SS United States is the largest ocean liner constructed in the US and the fastest ocean liner to cross the Atlantic. A luxury liner that could have been converted to a troopship had the need arisen, the ship operated until 1969. Since its retirement many of its parts have been auctioned off. Four of its propellers, each weighing over 60,000 pounds and reaching 18 feet in diameter, have been preserved, including this one which used to be on display at the Intrepid Sea, Air & Space Museum but now sits forgotten in a parking lot across the street.