1873 Closed 3 Proof

Twenty-five proof eagles left the Mint medal department in 1873, every one of them carrying the Closed 3 logotype that had replaced the original year-opening punch after Chief Coiner A. Loudon Snowden complained the figure resembled an 8. Working in the same season that the Coinage Act of 1873 was reorganizing the entire denomination structure, the press operators struck this minuscule run from polished dies that had been hand-finished with rotten-stone slurry, then pressed each blank twice at reduced speed to draw the rims and bring up the chamfered relief. Survivors today are estimated at roughly eight to twelve coins across both major services combined, with most graded examples falling in the PR60 to PR63 range and cameo contrast appearing on a minority of the population.

Authentication centers on two diagnostics that separate genuine 1873 proofs from impaired business strikes that have been polished to mimic the format. First, the rims should rise as squared, mirror-bright walls rather than the rounded, less-defined rims of the 800-piece circulation issue, and the dentils should appear sharp and individually delineated against the field rather than mushy. Second, the digit 3 in the date must show the closed configuration where the upper and lower curves nearly touch at their inner tips, leaving only a hairline gap; an open or widely spaced 3 with proof-like surfaces is a circulation strike that has been altered. Specific gravity should confirm the 90 percent gold composition and the weight should fall within tolerance of 16.718 grams, since gold-plated electrotypes and modern fantasy strikes have circulated for this date.

Auction appearances are infrequent enough that population reports lag behind actual market activity, and most known examples trace back to a small number of cabinet collections assembled before the Second World War. Heritage and Stack's Bowers have each handled fewer than a dozen confirmed offerings of the proof issue across the past quarter century, with prices for problem-free PR62 to PR64 examples generally moving in the high five-figure to low six-figure range depending on cameo presence. For a wider look at how the proof program intersected with the post-1873 monetary reorganization, the Liberty Head Eagle series history walks through the technical and legislative context.