The year 1837 has six die marriages needed to complete the year, including the very scarce B-5 coin at Rarity 5, and the rarest die marriage of the entire series, the B-6, which currently is an R-8, with only two known examples!
The date 1838 completes the series, represented by a lone die marriage rated as a R-1 (more than 1,250 coins). The mintage listed for 1838 is 366,000 coins. This would be, by far, the greatest number of coins struck from a single die pairing for the entire series. Could another die pairing be hiding for this date?