The 1840-O No Drapery Dime is easily the rarest date in this short-lived series. It has the lowest total population of the No Drapery type, the smallest number of Mint State examples, and the quality of Uncirculated examples shifts toward the lower end of the spectrum. The typical Mint State grade is only MS62 and, even there, only a few examples exist. The best example is a single PCGS MS65.
Unlike the 1840 Dimes from the Philadelphia Mint (which comes in No Drapery and With Drapery versions), the 1840-O comes only one way: No Drapery. Because collectors have only one option for the 1840-O Dime, there is even more upwards price pressure on this date.
The strike quality of the 1840-O Dime is inconsistent. Virtually all examples show weakness on the denticles. Normally, the stars are well-struck, or decently so, but other examples may show weakness on the shield and the O of ONE on the reverse (two opposing high points).
Mintmarks come in three different sizes: tiny, medium and large. The large mintmark variety appears to be the rarest.