Ron Guth:
The 1910-D Dime is fairly common in circulated grades but begins to pick up a nice value premium in Mint State. The 1910-D Dime is typically worth about half that of a comparably graded 1910-S even though the Mint State pooulations are about equal for each (hint, this makes the 1910-D seem like a great value and an underrated coin). For those collectors seeking out a Mint State 1910-D Dime, the most frequently-seen grades are MS63 and MS64. MS65 examples can be found with no difficulty, but in MS66 and better this date becomes conditonally rare. The best examples are a tiny number of MS67's.