One of the key dates in the Buffalo Nickel series, the 1937 D Three Legged Buffalo is the result of over zealous polishing of one of the reverse dies at the Denver Mint. This coin has been authenticated, encapsulated and graded XF 40 by Numismatic Guaranty Corporation (NGC), one of the leading third-party grading services in the country. Key date coins have historically been an excellent investment, with no pricing decreases ever registered since records started to be kept in the early 1900s.