David Hall: For the past 50 years or so, the 1918/7-D Buffalo nickel has been justifiably recognized as one of the most important 20th Century numismatic rarities. This bold overdate is rare in circulated grades, very rare in Mint State and almost impossible to find in Gem condition. The 1918/7-D is certainly the rarest coin in the Buffalo nickel series (excluding some more recently discovered varieties) and it is one of the most important coins of the 20th Century. This issue is usually fairly well struck. The rare Mint State coin usually has decent luster. Note that all genuine 1918/7-D nickels have a mintmark that tilts to the left.
Carl Womack PCGS Registry Set of Buffalo Nickels - Bowers & Merena 9/2004:384, $287,500 - Richard Hennessy Collection - Bowers & Merena 8/2006, $350,750 - Joseph C. Thomas Collection - Heritage 4/2009:2136, $253,000 - Heritage 1/2010:2458, $264,500 - Stack’s/Bowers 11/2012:3057, $195,500