The 1972 doubled die obverse Lincoln cent is one of the most popular Lincoln Memorial cent varieties. About 10 different types of 1972 doubled die Lincoln cents are known, though the rarest example of this major variety is a Type 1. Doubling can be seen with the naked eye in the date, motto IN GOD WE TRUST, and inscription LIBERTY. While a few thousand examples may exist, it's very scarce in MS67 and exceedingly rare in higher grades.