Cigarra Collection of U.S. coins missing Mint marks offered at auction
through April 5 by GreatCollections Coin Auctions includes the
Proof 1968 No S Roosevelt dime and Proof 1990 No S Lincoln cent.
included in the collection of the anonymous East Coast collector is a
1970 No S Roosevelt dime, 1971 No S Jefferson 5-cent coin, and 1983 No S Roosevelt dime, all in Proof. All of
the error coins offered would have originated from annual Proof sets
from the respective years.
from the Cigarra Collection is the Proof 1975 No S Roosevelt dime, of
which just two examples are known, and the Uncirculated 1982 No P
Roosevelt dime struck without the P Mint mark of the Philadelphia Mint.
1968 No S Roosevelt dime in the Cigarra Collection is graded Proof 68
by Professional Coin
Grading Service; the 1990 No S Lincoln cent, PCGS Proof 68 Deep
Cameo; the 1970 No S Roosevelt dime, PCGS Proof 68 Cameo; the 1971 No
S Jefferson 5-cent coin, PCGS Proof 69 Cameo; and the 1983 No S
Roosevelt dime, PCGS Proof 69Deep Cameo.
cause of the missing Mint mark errors is the same — the dies used for
striking each coin did not have the appropriate S Mint mark from the
San Francisco Assay Office added. During this time frame, the dies for
the coins would have been prepared in the die shop at the Philadelphia
Mint, including having the S Mint mark applied, before being shipped
to the San Francisco facility. In each case, either a Mint mark was
not added in error or a die intended to be used for circulation
production at the Philadelphia Mint was shipped in error to the San
Francisco Assay Office, where it was given Proof surfaces.
the collectible variants, the Proof 1968 No S Roosevelt dime is
considered the rarest. Based on the surviving population of fewer than
two dozen coins, numismatic researchers believe San Francisco Mint
production employees discovered the mistake early in the production.
1990 No S Roosevelt dimes were discovered in both the annual Proof
sets and Prestige Proof sets of 1990, with the Prestige set containing
a Proof 1990-P Eisenhower Centennial commemorative silver dollar.
Mint officials acknowledged that approximately 3,700 of the 1990 No S
Lincoln cents were struck, with 145 examples destroyed before they
were shipped from the Mint. Researchers believe fewer than 3,555 Proof
and Prestige Proof sets actually left the San Francisco Mint, since
fewer than 250 examples have been reported extant thus far.
1970 No S Roosevelt dime was first reported by collectors on Jan. 6,
1971. Two months later, U.S. Mint officials admitted the No S dime
population at 2,200 coins, having been struck with the same pair of
dies. A die scratch beneath the right upright of the N in UNITED is a diagnostic.
1971 No S Jefferson 5 cent coin was included in a reported 1,655 1971
1983 No S Roosevelt dime, like the 1970 No S dime, are collectible and
available to collectors seeking examples for their collections.
marks were added to all U.S. coins in 1980 except for Lincoln cents
struck at the Philadelphia Mint. Mint officials announced in 1984 that
the following year, all Mint marks would be placed on Proof coinage on
the master die instead of the working die.
in 1990, the Mint marks were placed on the master die for the cents
and 5-cent coins, with the dimes, quarter dollars and half dollars
undergoing the same transformation in 1991.