1829 Large Size Proof

The 1829 Large Size proof half eagle is one of the great rarities of American proof gold, with John Dannreuther and Harry Bass references suggesting only one to three pieces survive. The coin sits at a watershed moment in the series. Through the first half of 1829, Philadelphia continued striking half eagles on the original 25.0-millimeter open-collar planchet that had carried the Capped Head Left design since 1813. Midway through the year, William Kneass introduced a redesigned obverse paired with a close-collar method that narrowed the diameter to about 23.8 millimeters. A handful of mirror-finish presentation pieces were prepared from the early Large Size dies before the changeover. The site mintage figure of 57,442 reflects combined business-strike output across both diameters; no separate proof figure exists in Mint records this early.

Authentication of an 1829 Large Size proof begins with a calibrated caliper. The Large Size measures approximately 25.0 millimeters across, while the mid-year Kneass redesign measures roughly 23.8 millimeters; even a tenth of a millimeter outside that band warrants a closer look, and the measurement also rules out later Capped Head proofs from the reduced-diameter era. Weight should fall at exactly 8.75 grams in 0.9167 fine gold, with a reeded edge. The proof finish itself shows fully mirrored fields against frosted devices, sharply squared rims that meet the field at a clean angle rather than rolling into it, and the wire-edge effect created by metal flowing into the die's outer radius under repeated strikes. Bass-Dannreuther proof-only die marriage attribution and PCGS or NGC encapsulation are essential.

For modern collectors the 1829 Large Size proof exists almost entirely outside the open market. Examples reside in advanced cabinets and institutional holdings, with the most prominent appearance in recent decades coming through the Pogue Collection sales conducted by Stack's Bowers between 2015 and 2017. When a piece does surface, prices climb into seven-figure territory. The 1829 circulation Large Size is itself among the rarest dates in the half eagle run, with only twelve to fifteen business strikes known; the proof variant occupies a tier above that. Pre-1834 half eagles were melted in vast quantities once the world gold price moved above the U.S. coining ratio, and the Large Size 1829 was particularly exposed because it was already a small production heading for redesign. See the full Capped Bust Half Eagle series history.