1920-S

San Francisco struck 4,624,000 Walking Liberty halves in 1920, the second-highest 1920 mintage behind Philadelphia's 6.37 million pieces and well above Denver's 1.55 million. The S mintmark sits on the reverse at the lower-left rock beneath the eagle's tail feathers, in the position established for all branch-mint Walkers beginning in 1917. The 1920-S occupies an interesting middle ground in the series: the mintage alone does not qualify it as a semi-key, but condition rarity drives premiums sharply in mint state because survivors with both full strike and clean surfaces are uncommon. Date-set builders often find this date accessible in circulated grades but challenging in MS64 and above.

Strike weakness on 1920-S Walkers follows the series pattern with particular intensity. Liberty's left hand and skirt thumb area come soft on the great majority of examples, and the eagle's central breast feathers and central talon are weakly defined on most survivors. San Francisco production that year produced coins that often show smooth high points even on uncirculated pieces, making Full Strike examples genuine condition rarities. Authentication includes the standard 12.50 g weight and 30.61 mm diameter verification along with careful examination of the S mintmark. Genuine 1920 S punches display balanced curves with a consistent serif treatment, and the field surrounding the mintmark should show undisturbed luster flow. Inspect the reeded edge for sharpness and original definition. Counterfeit detection benefits from checking the overall relief of the design, since fakes tend to flatten Liberty's flowing drapery and the eagle's wing detail.

Professional Coin Grading Service (PCGS) and Numismatic Guaranty Company (NGC) population data reveals the 1920-S thinning rapidly above MS64, with MS65 supply constrained and MS66 examples scarce. Full-strike gems carry strong premiums over typical certified coins at the same grade. The 1920-S rounds out the 1920 trio as a date that punishes condition far more than mintage suggests, and serious collectors target it with the same care as the lower-mintage Denver issue. For the complete design and production history, see the Walking Liberty Half Dollar series history.