The Great Plagues: Six Coins is a boxed collection that contains six coins and a Certificate of Authenticity. The coins included in the set are a Seleucid bronze coin, a Roman bronze coin from the reign of Claudius II Gothicus, a Byzantine coin from the reign of Justinian I, a Genoan billon minute, a Spanish bronze coin, and a 5 Spanish centime coin from 1918. These coins circulated during the six great plagues—the Antonine Plague, the Plague of Cyprian, the Plague of Justinian, the Black Death, the Aztec Cocollztil, and the Spanish Flu.