This series was the first time that the half dime was struck in proof. While the Mint did not yet regularly produce and sell proof coins to collectors, whose numbers were extremely limited at the time, all dates of the Capped Bust Half Dime series are rumored or known to exist in proof format. Estimated mintages of these pieces range from just a few to a few dozen at maximum.
Third party coin grading company NGC has certified Proof Capped Bust Half Dimes for 1829, 1830, 1831, 1832, 1834, and 1836. Amongst these dates, there are two examples which have been awarded the cameo designation for 1830 and 1834. Across all dates, only 27 proof coins have been certified, which likely contains some resubmissions.
PCGS has certified slightly a total of 26 proofs, including the dates 1829, 1830, 1831, a834, and 1836. One cameo proof has been graded for 1829.
It is important to note that the status of some Proof Capped Bust Half Dimes is disputed. Some early die states which were sharply struck on exceptionally fine planchets have the appearance of proofs. To further complicate the problem, no specified proof dies are known. The regular business strike dies were used for the production of proofs usually struck regular coins for circulation both before and after the production of the enigmatic proof coins.
Collecting these pieces, like all early proof coinage, is extremely challenging. A date set or basic type set of the Capped Bust proof coinage can take decades to complete, due to the impressive rarity of these pieces.