The 1911-S Lincoln cent is one of the toughest semi-keys in the series beyond the most prominent regular-issue Lincoln rarities, including the 1909-S VDB, 1909-S, 1914-D, and 1931-S. While a scarce coin, many examples offer good eye appeal thanks to the fact that most are well struck. The 1911-S Lincoln cent is challenging in Brown uncirculated grades, and most especially above MS64BN.