2017-D Effigy Mounds

Denver's 2017 Effigy Mounds production reached 205,200,000 pieces, running 17.6 million behind Philadelphia's 222,800,000 for the same design and opening the year's Denver ATB output on a similar mid-range note. The narrow P-versus-D spread on this design reflects the more uniform 2017 production pattern that followed the wider 2016 swings: across the five 2017 ATB designs, Philadelphia and Denver mintages clustered within roughly 20 million of each other on every release. Richard Masters's reverse, with its aerial view of the Marching Bear Group mounds, was the first of three Masters-credited 2017 designs in the program.

Strike quality on the Denver issue often runs marginally crisper than Philadelphia in the mound edge definition and the field texture, though die-state variation across the production run is the bigger factor in any specific example's grade. The flat topographic composition makes strike pressure variations particularly visible on this design. The composition follows the standard clad formula (75% copper-nickel outer layers bonded to a pure copper core, 5.67 grams total weight, 24.26 mm diameter), and authentication concerns are essentially nil for circulation-strike modern clad coinage. The high-grade market runs through PCGS and NGC, the two leading third-party grading services. Raw MS65 to MS66 examples remain findable in original bank-wrapped Denver rolls.

The 2017-D Effigy Mounds is a Regular-classification issue where the certified-population dynamics follow the program's standard pattern with modest top-grade scarcity. The unusual aerial composition has kept the design's collector profile lower than the more figural 2017 entries (Frederick Douglass, George Rogers Clark, Ellis Island), which means MS68 prices for the Effigy Mounds date sit at the lower end of the year's range. Registry set builders absorb the limited top-grade supply, but the absence of a popularity premium keeps prices grounded. Roll hunters in the Upper Midwest still report occasional MS65 cherry-picks from original Denver bank rolls. For the broader story of the ATB program and the series' design arc, see the Washington ATB series history.