1878 Proof

The 1878 twenty-cent piece is the last coin of its kind. Congress passed the Act of May 2, 1878 repealing the denomination outright, ending a four-year experiment that had failed almost from its 1875 debut. The Philadelphia Mint struck 600 proofs that year and produced no circulation strikes, so every surviving 1878 is a proof. The figure sits modestly above the 510 proofs reported for 1877 and well below the 1,260 proofs of 1876, but the 1878 carries weight that mintage alone cannot capture. This is the date that closes the denomination. Collectors who assemble proof runs of the series treat the 1878 as the final required entry, and that set-completion pressure has shaped its market for nearly 150 years.

Strikes from the 600-piece production are generally sharp, with full radial detail on Liberty's seated figure and crisp eagle feathers, though the dies show some softening on the eagle's leg by the end of the run. Surfaces are typically reflective rather than frosted, and contrast-bearing examples are a clear minority. PCGS (Professional Coin Grading Service) and NGC (Numismatic Guaranty Company) populations for 1878 brilliant proofs do run higher than for 1877, consistent with the larger mintage, but Cameo (strong contrast between mirrored fields and frosted devices) and Deep Cameo designations remain genuinely scarce in proportion. The plain edge, smooth and uninterrupted, is standard for the denomination and helps separate the twenty-cent piece from the reeded quarter at a glance. Common impairments include hairlines from old cleaning attempts, faint cabinet friction on Liberty's knee, and the occasional milk spot in the obverse fields. Properly cared-for examples in original holders survive in usable condition, but cleaned coins outnumber undisturbed ones in dealer inventories.

For collectors, the 1878 proof functions as the more attainable of the two proof-only dates, since the 1877 sits behind a tighter mintage and thinner survivor pool. PCGS estimates roughly 500 1878 proofs survive in all grades, with about 55 in PR65 or finer and one PR67 reported at the apex per current PCGS population data. Most market-grade pieces trade in PR63 and PR64, where the retail band runs in the high four figures. Cameo and Deep Cameo specimens command real premiums, sometimes multiples of the brilliant-proof price, and the difference compounds at PR65 and above. A complete denomination set of five circulation strikes from 1875 and 1876, paired with four proofs from 1875 through 1878, gives a clean nine-coin finish to one of the shortest U.S. silver series. For the denomination's broader story, see the Twenty-Cent Pieces (Seated Liberty Obverse) series history.