H.E. Harris folder holds Lincoln Cents from 1909 to 1940 along with history on the inside flap. This is a tri-fold folder that opens flat for all at once viewing with a total of 90 openings then closes to book size for easy storage. The number of coins minted and the year is printed below each opening of this folder. All H.E. Harris folders are made of acid-free materials for the protection and storage of your coins. The holes in this folder have a special LOCK-IN feature. But first a word of caution: always hold a coin by the edge and never touch its obverse or reverse. We recommend you wear gloves when pressing your coins into place. Now that you are ready simply place the coin with one edge tipped into the hole and then press the high edge downward and toward the lowered edge (slantwise). Feel the snap? It s locked in! The Lincoln cent was introduced in 1909 to commemorate the 100th anniversary of the birth of Abraham Lincoln. It was the first U.S. coin to portray an actual person and the first cent to bear the motto In God We Trust .