What's Happening?
The 1945-S Micro S Mercury dime has garnered significant attention in the numismatic community, with two examples selling for over $25,000 in March 2019, and another for $18,000 in May 2024. These dimes are distinguished by a small 'S' mintmark, which
differs noticeably from the standard 'S' found on other 1945-S Mercury dimes. Research by numismatist David W. Lange indicates that this unique punch dates back to 1907 and was originally used by the San Francisco Mint for coinage intended for the Philippine Islands until 1919. In 1945, amidst the substantial demand for circulating coinage during World War II, an older mintmark punch, believed to be the Philippine punch, was reused by the San Francisco Mint. This unexpected reappearance created the 1945-S Micro S variety. The variety was first discovered by Bernard J. Maier in 1947, only two years after the coins entered circulation, and has since been recognized by major grading services like PCGS and NGC.
Why It's Important?
The 1945-S Micro S Mercury dime represents a compelling case study in numismatic rarity and value, demonstrating how subtle manufacturing variations can lead to substantial market premiums. The historical connection to Philippine coinage adds a unique layer of intrigue, linking American coin production to an earlier chapter of U.S. monetary history. The significant price differences observed between circulated examples (which can be under $25) and pristine, 'Full Bands' specimens (reaching five figures) highlight the critical role of condition and strike quality in determining a coin's worth. The 'Full Bands' designation, indicating complete separation of the horizontal bands on the fasces on the reverse, is particularly sought after, with only an estimated 10% to 12% of surviving Micro S examples exhibiting this feature. This variety underscores that true rarity is often determined by survival rates and certified population data, rather than just initial mintage figures, as the Mint did not record how many 1945-S dimes received the Micro S mintmark.
What's Next?
Collectors and numismatists will continue to seek out and analyze 1945-S Micro S Mercury dimes, particularly those in high grades with the 'Full Bands' designation. The ongoing appearance of elite examples in auctions, such as the one in October 2026 that sold for $15,255, indicates sustained market interest. The challenge for collectors remains accurate attribution, as the small size of the mintmark can be affected by circulation wear and die wear. Educational resources, such as photographic comparisons provided by PCGS, will continue to be vital for identifying genuine Micro S varieties. The market will likely see continued competition for the finest certified specimens, influencing future auction prices. The story of the 1945-S Micro S serves as a reminder for collectors to meticulously examine mintmarks, as a seemingly minor detail can reveal a rich historical narrative and significant financial value.
