1910-S

The 1910-S Barber dime came out of San Francisco with a business-strike mintage of 1,240,000 pieces, a figure that sits well under the 1.5 million threshold defining the lower tier of S-mint output in this series. The 1910-S falls between the famous sub-million S-mint rarities and the bulk multi-million dates, but its mintage is light enough that surviving examples thinned noticeably through decades of West Coast circulation. Charles E. Barber's Liberty Head design had been in service since 1892, and by 1910 the working dies and routines at San Francisco were fully matured. The coin weighs 2.50 grams, measures 17.9 millimeters across, carries a reeded edge, and is struck in 90 percent silver and 10 percent copper.

Strike quality on the 1910-S runs from soft to acceptable, with central detail on Liberty's headband serving as the usual diagnostic for grade. Lettering on the LIBERTY headband is the single most important wear indicator on every Barber dime, and on this issue the letters tend to show even, honest wear. The S mintmark on a genuine coin is a small, rounded letter seated beneath the wreath ribbon. Because the 1910 Philadelphia issue had a mintage above 11 million and trades at a small fraction of the 1910-S price, the main authentication concern is an added-S mintmark on a Philadelphia host coin. Examine the area under magnification for surface continuity with the reverse field, the correct rounded S shape, and clean metal around the base; added mintmarks often show a faint seam or tooling marks. PCGS (Professional Coin Grading Service) and NGC (Numismatic Guaranty Company) certify the issue without unusual notation, and a weight reading at 2.50 grams remains a useful first filter.

Within a date and mintmark set, the 1910-S occupies a middle-tier slot, more available than the sub-million S-mint rarities but distinctly scarcer than the bulk Philadelphia dates of the same period. Circulated examples in Good through Fine are obtainable at major shows for a modest premium over common dates, and Very Fine to Extremely Fine pieces reach the market regularly. Choice Mint State coins are the real condition challenge, with original luster and clean cheek surfaces commanding strong premiums in MS-63 and finer. For broader context on design history and rarity, see the Barber Dimes (Liberty Head) series history.