2018-S Silver Proof

The 2018-S Roosevelt dime proof came out of San Francisco at 381,748 pieces, a 6 percent pullback from the 406,986 2017-S silver figure as the program continued near the modern low band. The 2018 silver proof set carried the silver-content America the Beautiful Quarters ninth-year five-coin set and the dime, all using the same 90 percent silver, 10 percent copper alloy that had governed Roosevelt silver-proof composition from 1992 forward and dime circulating composition from 1837 through 1964. The silver dime weighed 2.50 grams against the 2.268-gram clad and carried the S mintmark sharp above the date. The 2018-S silver proof is the closing date of the 90 percent silver-proof era, beginning with the 2019 issue the U.S. Mint shifted silver-proof composition to .999 fine silver, ending the 1992-2018 pre-1965-alloy run.

Authentication on a 2018-S silver proof rests primarily on the composition diagnostics. Weight on a calibrated scale must read 2.50 grams against the clad 2.268 grams; this single best non-destructive test reliably separates silver from clad proof issues at the same date. Surface tone should show the bright white-silver appearance characteristic of 90 percent silver rather than the warmer copper-nickel hue of the clad proof. Edge view should display the solid silver-color profile rather than the dark copper-core sandwich visible on the clad. PCGS and NGC encapsulation labels designate the issue as "Silver" and the Cameo and Deep Cameo certifications carry the routine PR69 DCAM and PR70 DCAM premium structure. The 90/10 silver tone runs slightly warmer than the .999 fine silver issues that follow in 2019 because the 10 percent copper alloy carries a faint undertone absent from pure-silver issues.

The 2018-S silver proof sits in the lower band of the modern silver-proof Roosevelt range, with the 381,748 figure tracking the post-2015 program-low pattern. PR69 DCAM is available at the standard silver-proof price level and PR70 DCAM forms the meaningful condition-rarity step where PCGS and NGC populations thin to registry-relevant levels. The issue carries a special structural distinction as the final 90 percent silver-proof Roosevelt dime ever produced; collector interest centers on the closing-date status of the 1992-2018 90/10 silver-proof program before the .999 fine silver transition takes effect in 2019. For the closing chapter of the 90 percent silver-proof era, see the Roosevelt Dime series history.