1958 Proof

The 1958 proof Roosevelt dime is the Philadelphia silver proof issued through the annual Proof Set program, with a mintage of 875,652 pieces. The 1958 figure stepped down from the 1,247,952 1957 mintage but remained well above the 669,384 figure from 1956, reflecting the continued strength of postwar collector demand for Mint-issued proof sets. The drop relative to 1957 was modest enough that Proof Set distribution would rebound to seven figures in 1959, making 1958 a temporary dip in the broader upward trend of the late-1950s. The coin carries John R. Sinnock's standard 1946 design, with the FDR portrait on the obverse and the torch with olive and oak branches on the reverse, struck from polished dies on polished planchets at Philadelphia. The "JS" initials at the truncation of the bust appear with sharper definition than on circulation work thanks to the careful preparation of proof dies.

The 1958 proof follows the silver-era specifications: 2.5 grams, 17.9 millimeters, 90% silver and 10% copper, reeded edge. Authentication of a 1958 proof rests on distinguishing genuine proof characteristics from prooflike business strikes. True proofs show squared, sharply defined rims with the small step where rim meets field, fully mirrored fields with consistent reflectivity at every viewing angle, and crisp definition across the torch flame, leaves, letters, and FDR's hair. Cameo contrast on 1958 proofs is inconsistent because the adjusted polishing routine of the mid-1950s continued to reduce the longevity of frosted device texture across a die's working life. Cameo (CAM) populations are smaller than on early-1950s proofs, and Deep Cameo (DCAM) populations are genuinely scarce, with the strongest-contrast examples concentrated among the earliest impressions from each newly polished die pair.

Survivor distribution covers PR60 through PR68, with PR66 and PR67 the most heavily traded grades. The DCAM premium widens sharply at PR67 and finer because of the limited supply of strong-contrast survivors. Hairlines from old wipes and small contact marks from set storage are the typical impairments below PR65. For broader context, see the Roosevelt Dime series history.