One of the first collaborative ventures by American Bank Note Company was in 1972 with the Wittenauer Mint. Wittenauer had created a series of thirty-six sterling silver medals featuring all U.S. Presidents up to that time. ABNC enhanced these with engraved portraits of each president. The portraits were printed on 4" x 6" white card stock with a die-cut hole below the engraving. The engraved prints were inserted into a Lucite case and the medal was added. Medals weighed a little over one ounce and came in either a matte finish or a gold-plated mirror finish. A historical booklet came with some medals, but it is not clear whether these were included with the ABNC sets. Over the years, as the price of silver spiked, the medals were often removed from their cases and the ABNC portraits discarded. They have become increasingly harder to find as complete sets.