1926-S

Few issues in the entire Standing Liberty Quarter series carry the strike-quality reputation of the 1926-S, a semi-key that is widely considered the worst-struck date in MacNeil's twenty-five-cent series. With a San Francisco mintage of 2,700,000 pieces, the 1926-S is not particularly low in raw numbers, yet collectors who have spent decades searching for sharply detailed examples consistently rank it as the most difficult coin in the run to locate with full original detail. Excessive die clashes, deteriorated working dies, and inconsistent striking pressure at the San Francisco facility combined to produce coins on which Liberty's head, the central shield rivets, and the eagle's breast feathers often appear mushy or completely flat, even on coins that grade as Mint State based on luster and surface preservation alone.

The obverse continues MacNeil's gateway composition with Liberty draped in chain mail, holding shield and olive branch, with the date recessed in the Type 3 manner. Genuine specimens weigh 6.25 grams, measure 24.3 millimeters across, and carry a reeded edge in the standard 90 percent silver alloy. The S mintmark sits on the obverse above and to the left of the recessed date, and the MacNeil M monogram appears at the shield base. The critical authentication and grading diagnostic on this date is strike quality itself. Full Head designation, which requires the three headband leaves to be distinctly separated, the hair detail intact, and the ear cavity clearly defined, is exceptionally rare on the 1926-S. Most collectors accept partial head detail and judge the coin on a relative scale rather than the absolute Full Head standard applied to better-struck dates. Authenticators also verify that mushiness reflects original striking weakness rather than post-mint wear or environmental damage.

Premiums on sharply struck 1926-S examples can be dramatic, with PCGS and NGC Full Head populations recorded in the single digits across many grade levels. For population data and comparative scarcity, see the Standing Liberty Quarter series history.