A rare 1975 dime missing the letter "S" to signify the San Francisco mint it was pressed at has been discovered and is expected to fetch over half a million dollars by the end of October. This rare coin can be viewed in person in Tampa, Florida this week.
The dime was discovered by a California coin collector who purchased five 1975 proof sets from the U.S. Mint. There have been six instances since 1968 where "No S" Proof dime errors were mistakenly released by the U.S. Mint. These errors occurred when dies were shipped to San Francisco without the mint mark and were still used to strike proof coins.
The years in which No S Proof Dimes were struck were 1968, 1970, 1971, 1975, 1983, and 1990. While there are two to three dozen known to be in existence since 1968, there are hundreds known to be in existence for the years 1970, 1971, 1983, and 1990.
Currently, there are only two known No S Proof Dimes in existence for the year 1975. One of these coins was discovered in 1977 by California coin collector Fred Vollmer.
The coin is up for auction by GreatCollections Certified Coin and Paper Money Auctions, with a current bid of $266,000 and 47 days left until the auction ends. The president of GreatCollections Auctions LLC, Ian Russell, expects the dime to fetch over $500,000.
For those interested in viewing this rare dime, it can be seen at greatcollections.com or at the Great American Coin and Collectibles Show at the Tampa Convention Center in Florida this week.