A souvenir marking or medal is a keepsake item .
It is made with a 5 - cent coin from a coin , medal or metal former , by being forced between two steel rolls through .
It is a motif on one of the rolls , and when the coin passes through the rollers , the subject is injected under pressure ( several tons ) . In this process, the coin to a flat , ellipsoidal plate with a motif . Therefore, these coins are called in the United States also " Elongated Coin " , which translated means prolonged coin .