Proof 1977-S Nickel Overstruck on 1977-S Dime
Double Denomination with Two Dates
This is the only double denomination of the four known showing two dates.
A group of modern United States proof errors surfaced recently from a 40 year old collection. Double denominations (U.S. coins struck on smaller denomination coins) were unknown. Four proof Jefferson nickels overstruck on struck dimes were in this collection.
On this double denomination, the design of the dime is clearly visible on both the obverse and reverse upon close examination. It is a flip-over double denomination. The 1977 dime date is clearly visible in the field to the right of Roosevelt's neck. Roosevelt's profile is visible under both sides of the memorial. Other details from the Roosevelt dime reverse design are visible under the Jefferson obverse design. This is the only double denomination of the four known showing two dates.
Recently in a Heritage auction, a similar 1977-S Proof Jefferson Nickel struck on a Roosevelt Dime, but without a visible date from the dime design, sold for $9,300.
Proof coins are struck by technicians who hand feed the blanks into special presses. They are produced, examined and packaged using extreme quality control. It is very unusual to find major proof errors. A few broadstrikes, off-centers, double strikes (in collar) and off-metals have been known to be found in sealed proof sets. Proof errors are aggressively sought after by many error collectors.
A very small group of Proof errors recently came from a collection that was auctioned by the State of California. The U.S. Secret Service inspected and released this collection to the State of California determining that it was legal to own. The State of California then auctioned the collection and it has been dispersed since the sale.
Roosevelt's portrait and the 1977-S
date are visible from the understrike:
The olive branch from the dime reverse
design is visible from the understrike:
Proof Errors are featured in the NLG award
winning book, World's Greatest Mint Errors.