2018-D Block Island

Denver's 2018 Block Island production came in at 170,800,000 pieces, the highest D-mint figure of the year and a 38 percent step up from the Philadelphia issue. The widening D-mint share is a consistent pattern in the late ATB run and tracks Federal Reserve quarter demand from the upper Midwest and western districts. Phebe Hemphill's reverse pairs a black-crowned night heron in stride with an American oystercatcher and chick, the highest relief-density composition in the 2018 lineup. The D mintmark sits just right of Washington's queue on the obverse, in standard ATB position; mintmark size is small enough that raw coins occasionally get misattributed to Philadelphia when the mintmark sits on a soft area of the planchet.

Production characteristics at Denver during the 2018 cycle favor the small-relief features. D-mint examples typically show fuller heron-crown detail and a crisper oystercatcher beak than Philadelphia counterparts, with the chick texture rendering comparably between the two mints. Die-wear sequence runs chick first, then heron crown, then oystercatcher feathering, which means a coin with a sharp chick and a softer heron is almost always early die state. PCGS, the Professional Coin Grading Service, and NGC handle the slabbed market for registry submissions, and raw rolls still surface from Federal Reserve channels in the western tier where the D-mint coins concentrated. The clad composition is the standard 75% copper-nickel over copper at 5.67 grams.

The 2018-D Block Island is a Regular classification entry, abundant raw and through MS66 and turning into a condition rarity at MS68 because the dense relief penalizes die wear. Population reports show the D-mint slightly more available at MS67 than the Philadelphia counterpart, the typical late-series pattern that tracks the larger D-mint production. Registry collectors building the 56-coin clad set price the P and D 2018 Block Island as a paired tier with neither side carrying a meaningful premium. For the broader story of the ATB program and the series' design arc, see the Washington ATB series history.