Up for sale is a rare 1968 S proof Lincoln Memorial penny with a doubled die obverse. This coin features an error and is ungraded and uncertified. The coin was minted in San Francisco and is composed of copper. The strike type is proof and the denomination is a small cent. The coin is circulated and has a beautiful red color. The certification number is 1968S-1D0-007P and the variety is DOUBLED DIE OBVERSE. This coin is a must-have for any serious coin collector and is a unique addition to any collection.