As time has passed and more and more coins have been certified, we have a better, slightly different, view of the 1914-S $10 gold coins. It is, indeed, a scarce date but not the incredible condition-rarity it was once believed to be. In terms of overall population, the 1914-S mimics most closely the 1909-S and the 1916-S. Substantial numbers of MS62 and MS63 examples of the 1914-S have appeared over the years. While the population report numbers are nowhere near as high as those of common dates like the 1926 and 1932, there seems to be a sufficient supply to satisfy collector demand. In MS64, the 1914-S becomes scarce but, even there, it is not nearly as rare as the 1909-S or the 1912-S. MS65 is where the 1914-S really hits its stride -- only about a dozen or so examples have earned that grade. Above MS65 the 1914-S is an extreme rarity, and only a single example has appeared at the MS66 level, with none finer.
American Numismatic Rarities 6/2006:2641, $253,000 - Kutasi Collection - Heritage 1/2007:3183, $161,000
Heritage 1/1999:8323 - Kutasi Collection - Heritage 1/2007:3182, $27,600 - Bentley Shores Collection - Stack's/Bowers 8/2013:4559, $30,550