BULGARIA: Lot of 4 commemorative coins in silver (0,500) composed of 20 Leva (1978), 20 Leva (1982), 20 Leva (1987) & 20 Leva (1988). (KM 106+133.1+164+173) & (Nikolov 131+192+205+216). The first is Uncirculated and the rest are Proof. The 20 Leva 1988 coin has a strange damage close to the date, maybe by the mint.