Ron Guth:
Half Dime production resumed in 1829 (none were produced after 1805). The design was a smaller version of the Capped Bust design that had been utlized on Dimes since 1809). Utilizing the most up-to-date technology, the Capped Bust Half Dimes were all struck with a "close" collar, an edge die that created uniform diameters and square edges on the coins.
Over 1.2 million Half Dimes were produced in 1829, a phenomenal output in a series that had never seen a mintage above 87,000. Thus, the 1829 Half Dime is easy to find on circulated grades and in Mint State grades up to MS-64. Gem examples become scarce and MS-66 and better examples are quite rare. The finest examples certified by PCGS (as of July 2011) are two MS-67s.