1870

The 1870 eagle occupies an unusual place in Liberty Head series chronology because it is the year the Carson City Mint opened its doors, producing the first CC eagle alongside the established Philadelphia and San Francisco issues and giving the With Motto type its first three-mint year. Against that backdrop, the Philadelphia issue itself is genuinely scarce: just 3,990 business strikes were coined (with 35 proofs accounting for the remaining 35 pieces toward the often-cited 4,025 figure), one of the lowest mainline Philadelphia eagle mintages of the entire post-motto era and a direct reflection of weak circulating gold demand during the Reconstruction-era specie suspension.

For collectors, the 1870 is a true Key Date that has long been overshadowed by the more famous 1870-CC. Doug Winter estimates fewer than 100 business strikes survive across all grades, with the typical example grading EF40 to AU50 and properly graded uncirculated coins essentially unknown, NGC has reported a single MS60 against a complete absence at PCGS in Mint State. Authenticators rely on a combination of weight verification (16.718 grams against the standard, with specific gravity near 17.2 ruling out modern gold-plated counterfeits) and close die-state study, since survivors are characteristically described as "heavily abraded with semi-prooflike surfaces", an uncommon combination that makes added-mintmark or struck-counterfeit candidates relatively easy to filter when the surface texture does not match documented die behavior. Eye appeal is the dominant condition variable rather than technical grade.

In the marketplace the 1870 trades as a sleeper relative to its rarity, with circulated EF examples typically bringing four-figure sums and choice AU material crossing into the high four to low five figures depending on originality. Comparable Heritage results for similarly low-mintage 1870s Philadelphia tens, the 1872 in AU55 at $10,800 and the 797-mintage 1877 in AU58 at $19,200, both in December 2023, frame the modern price ladder for early Reconstruction-era Philadelphia eagles and underline how the 1870 remains undervalued for a coin with fewer than 100 known survivors. Buyers should prioritize originality and surface character over numerical grade, and certified examples from PCGS or NGC are essentially mandatory at this rarity level. For broader context on the type, see the Liberty Head Eagle series history.