BULGARIA: Lot of 2x 10 Leva (1974) in black on blue and multicolor unpt. Georgi Dimitrov at left on face. Seven digits consecutive S/Ns: "OИ 1870509 / 1870510". WMK: Hands holding hammer and sickle. Printed by (Goznak). (Pick 96b) & (Kraptchev 94b). Uncirculated.