A famous 1960s error was the 1964-D “Missing Monticello” coin. This issue arises when a striking error removes the Monticello structure on the reverse of the coin. Because it's obvious, collectors value this error. Very good coins can fetch $3,000 or more.
A curious error doubles the obverse design of the 1964 Double Die Obverse (DDO) Jefferson nickel. In “IN GOD WE TRUST” and “LIBERTY,” this doubling is most apparent. High-grade errors can sell for thousands at auction.
Among the most expensive late 1960s Jefferson nickel faults is the 1969-S Doubled Die Reverse. Duplicated lettering and artwork on the reverse side include Monticello and “E PLURIBUS UNUM.” Over $10,000 was paid for mint-condition transparent doubling coins.
While not a mistake, the 1960 Jefferson nickel with “Full Steps” is very desirable. All five Monticello stairs are visible on the reverse of Full stairs nickels without breaks or wear. Few Full Steps coins exist since this detail is hard to strike. A 1960 Full Steps nickel in MS66+ condition is valued over $15,000.
Accidentally stamping the mintmark twice in slightly different positions causes the 1964-D Repunched Mintmark (RPM) mistake. Some errors are rarer, but this one is valuable. Clear RPM mint coins sell for more at auction.