1. 1965 Roosevelt Dime (No Mint Mark)

The year 1965 marked a major transition in U.S. coinage, as silver was removed from dimes and replaced with a clad composition. During this time, mint marks were also temporarily omitted, which means all 1965 dimes appear without one.

While millions were produced, some examples in exceptional condition can sell for over $1,000. Even more valuable are the rare 1965 dimes mistakenly struck on silver planchets, which have sold for thousands of dollars.

2. 1968-S “No-S” Proof Roosevelt Dime

This coin is one of the most famous modern error dimes. Proof coins from San Francisco are supposed to carry an “S” mint mark, but a small number of 1968 proof dimes were struck without it.

Only a handful of these coins are known to exist, making them extremely valuable. One example sold for more than $40,000 at auction, and demand remains strong among collectors.