The 1847 Dime is not known for being particularly rare, but it is far less common than generally perceived. Overall, it is twice as rare in circulated condition as the 1844, 1845 and 1846, though both the 1844 and 1846 are considerably rarer in Mint State. Rather, the 1847 is on par with the 1848 and 1849 Dimes in terms of overall population and how the grades are distributed among thatr population.
Over a dozen 1847 Dimes are known in Mint State, though they generally grade MS62 or lower. Choice BU and Gem examples are very rare. The best example is a single PCGS MS66, which is a remarkable exception to the rule. Collectors seeking value will realize quickly that once one moves below the MS64 level, this date becomes quite affordable, even though the coins still rank in the Condition Census.