20 Drachmas (1976) (type I) in copper-nickel. Temple of Apteros Nike at center and inscription "ΕΛΛΗΝΙΚΗ ΔΗΜΟΚΡΑΤΙΑ" on obverse. Head of Pericles facing left on reverse. Inside slab by NGC "MINT ERROR MS 64 / BROADSTRUCK". Cert number: 5779887-026. (Hellas 310).