1906-D

The 1906-D occupies a permanent place in Denver Mint history as the first $10 Liberty Eagle ever struck at the Colorado facility. Denver had operated as an assay office since 1863, but full coining operations did not begin until 1906, and this issue belongs to that inaugural class of branch-mint gold. The window for a Denver Liberty Eagle was extraordinarily narrow: the design was retired the following year in favor of the Saint-Gaudens Indian Head, leaving only two D-mint dates (1906 and 1907) before the series ended. That two-coin run gives the 1906-D a built-in collecting significance no other branch-mint Liberty Eagle can claim, regardless of mintage figures.

Production reached 981,000 pieces, a healthy figure that makes the 1906-D the more obtainable of the two Denver dates and a genuinely available coin in circulated grades. Mint State examples turn up regularly through MS62 and MS63, with quality dropping off sharply above MS64; gem material exists but commands a steep premium that reflects scarcity rather than mintage. Authentication on a first-year branch coin centers on the mintmark itself: the D should sit cleanly below the eagle on the reverse, with serif geometry consistent with the 1906 Denver punch. Weight should hold at 16.718 grams and specific gravity near 17.2; lightweights or off-color surfaces signal cast counterfeits, and any mintmark that appears tooled, raised, or inconsistent in font with documented Denver examples warrants outright rejection.

For the date collector, the 1906-D is the affordable entry point into Denver Liberty Eagle territory, and most type sets that aim to include a D-mint example default to this issue rather than the scarcer 1907-D. NGC population data places it at roughly ten times the rarity of the truly common dates in the series, and recent PCGS/CAC MS64 results have settled in the $2,400 to $2,950 band, with MS65 examples crossing into five-figure territory. It is a coin that wears its history on its surface, a piece struck in the opening months of a brand-new mint, on a design with only one year left to live. For the broader context of how Denver fits the 1838 to 1907 arc, see the Liberty Head Eagle series history.