1970 No S Proof Roosevelt Dime

The 1970 No S proof dime is another example of a missing-mintmark die error from the San Francisco Mint, following the pattern first seen in 1968. A working die prepared without the mintmark produced a limited quantity of dimes that were sold inside 1970 proof sets before collectors identified the anomaly.

It is generally considered less rare than the 1968 and especially the 1975 No S dimes, but it remains a recognized and collectible error variety within the broader Roosevelt dime series.

Proof coinage from the San Francisco Mint in the years following 1968 occasionally suffered from similar quality-control lapses in mintmark application, and 1970 produced its own instance of a No S dime alongside a well-known No S proof Jefferson nickel from the same year. These errors highlight the manual steps involved in preparing proof dies during this period.

As with the 1968 error, the 1970 No S dimes were discovered by attentive collectors examining proof sets, and the variety has since become an established, catalogued part of Roosevelt dime error collecting.

Like other proof dimes of the era, the coin shows sharp, mirrored fields and crisp devices on both the Roosevelt obverse and the torch reverse. The defining trait is the total absence of the 'S' mintmark on the reverse, to the left of the torch's base, where a 1970-S proof dime should display it.

Buyers should be cautious of coins with a mintmark that looks removed, filled, or otherwise altered, as opposed to a genuinely die-struck blank area; certification by a reputable grading service is the standard way to confirm authenticity.

The 1970 No S dime is considered less scarce than the 1968 or 1975 varieties, with a larger number of surviving examples believed to exist, which is reflected in generally lower, though still meaningful, market prices. Certified gem proof examples have traded in the low thousands of dollars, with premiums for exceptional quality.

As with all No S error dimes, most of the value depends on certification, since visual identification alone cannot rule out an altered coin.