1948-S

The 1948-S quarter saw 15,960,000 pieces struck at San Francisco, a notable jump from the 5.5 million figure of the prior year and the highest S-mint output for the date among the late-1940s coins. The increase reflects renewed Treasury orders for Western quarter coinage as the postwar economy expanded; San Francisco often ran on a smaller schedule than Denver or Philadelphia, but 1948 brought its output closer to its larger sister mints. The S mintmark on the reverse below the wreath is the correct placement for San Francisco quarters from 1932 through 1964, and on this date the punch is typically clean with no underlying letter trace.

Strike quality on the 1948-S is generally crisp, with San Francisco's careful die work showing in the eagle's breast feathers and Washington's hair detail above the ear. The mintmark deserves close inspection under five-to-ten-power magnification despite its usual cleanliness on this date, because the over-mintmark practice that produced the famous 1950-S S/D variety came out of the same die-shop workflow two years later. Counterfeit alteration is the dominant authentication concern for the issue: an added S on a 1948 Philadelphia coin can pass casual inspection, and tooling marks around the punch base or a slightly raised collar are the standard diagnostics. Population reports at PCGS, the Professional Coin Grading Service, show the date is well-represented through MS65, with the meaningful condition pressure appearing at MS66 and above where registry buyers concentrate their bids.

The 1948-S is a common date in the modern catalog, set-fillable in circulated grades for moderate premiums over silver melt and obtainable in MS65 without much hunting. Original-skin examples with attractive peripheral toning command pleasing premiums, since the dipping cycles of the 1960s and 1970s removed most of the natural color from the surviving population. Realistic acquisition for serious collectors is a certified MS66 from a major auction, with the genuinely difficult upgrade target at MS67 where pricing climbs into four-figure territory and the population census drops sharply. For the broader story of John Flanagan's design and the series' production arc, see the Washington Quarter series history.