1825 5 Over 4 Over 1 Proof

The 1825/4/1 proof half eagle stands among the great rarities of American proof gold, with only three examples known. The coin descends from die-marriage BD-2, a working die with one of the most unusual histories in the early federal gold series. The die was first prepared as 1821, then returned to the engraving room and partially altered to 1824, and finally re-engraved a third time as 1825. The result is a date logotype carrying ghosts of all three previous identities, with a clearly visible underlying 1 at the lower right of the final 5. Philadelphia struck the coin in proof format from this same triple-punched working die, polishing the dies to mirror finish and selecting planchets one at a time. Decades have passed between confirmed appearances, and the entire surviving population can be counted on the fingers of one hand.

Authentication of an 1825/4/1 proof half eagle begins with provenance. With one or two coins known, every legitimate example has a documented chain of ownership reaching back through major auction houses or institutional collections, and any candidate without that pedigree should be treated as suspect. Variety attribution focuses on the date 5, where the diagnostic underdigits remain visible in mirrored proof fields with greater clarity than on business strikes. Look for the curved bowl of the underlying 4 inside the upper portion of the 5, and trace the vertical shaft of the underlying 1 at the lower right of the same digit. Specifications match the Kneass-narrowed Capped Bust standard used 1813-1829: 8.75 grams gross weight, approximately 25.0 mm diameter, and 0.9167 fine gold alloyed with copper and silver. The mirrored fields should display the deep reflectivity that distinguishes a true proof from a prooflike business strike, and PCGS or NGC certification is essential at this level.

The 1825/4/1 proof occupies a tier of rarity reserved for coins that almost never trade. When one does surface, the auction is a generational event rather than a routine sale, and prices climb into high six-figure or seven-figure territory depending on grade and market conditions. Most collectors of Capped Bust gold will never see one in person, and even advanced cabinets specializing in proof gold treat the date as effectively unobtainable. For deeper context, see the Capped Bust Half Eagle series history.