In 1988, a San Francisco jeweler created a custom Monopoly board that was worth 2 million dollars. It had rubies, diamonds, and sapphires in it and had solid gold horses and hotels. The Strong National Museum of Play in Rochester, NY bought the Charles Darrow game that he had copied from the game Charles Todd and he had played in the early 1930s. He had given it to a small company to manufacture before Parker Brothers bought it in 1935. It was a cloth board that Darrow's family had played on, and the museum bought it for over $146,000! Darrow changed the board to a square format after a short time and it was that form that Parker Brothers acquired. If it is just a standard edition old Monopoly set, even with everything in mint condition with all the accessories, all sources agree that they are not worth more than $200.