1970-S Small Date Doubled Die Obverse Lincoln Penny
The approximate value of these coins is around $3,500. However, this is highly dependent on the condition of the coin, and the doubled die obverse. If the coin exhibits strike doubling rather than only one side of the penny showing doubling, the value diminishes.
1972 Doubled Die Obverse Lincoln Penny
A variation of the Lincoln penny produced in 1972 shows robust doubling on all elements. An interesting feature about this penny is that there isn’t any mint mark. If you ever come across such a coin, you can verify your findings using a ‘die marker.’