HUNGARY: 1 Thaler (1638 NB) in silver with laureate bust of Ferdinand III in ruffled collar facing right in inner circle. Crowned double-headed eagle dividing "NB" inside inner circle and legend surrounding on reverse. Inside slab by NGC "AU 50". Top grade and the only one actually certified by NGC. (KM 112) & (Dav. 3201). Extremely rare coin!