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 63 / STRUCK 10% OFF CENTER". Cert number: 6648857-014. (Hellas 310).