Ron Guth:
With a mintage of over 19 million coins, the 1912 Dimes is one of the most common of the series and one of the best choices for type collectors. It is common in all grades. PCGS alone has graded over 900 Mint State examples, mostly in a range from MS62 to MS65 inclusive. Gem examples are common through MS66. In MS67, the population of 1912 Dimes drops off a cliff, with fewer than a dozen certified by PCGS -- and none finer.
Two of the nicest 1912 Dimes are both PCGS MS67+. The first has amazing, multicolored toning; the second is a mostly white example from the Lily Nicole Collection.