BULGARIA: 1 Lev Srebro (ND 1916) in black on green and blue unpt with cross and curl pattern. Two digit S/N: "36 396581" with prefix. Signatures: Chakalov & Venkov. WMK: Cross & curl. Printed by (RDK). Inside holder by PMG "Superb Gem Unc 67 EPQ". Top pop in PMG. (Pick 14b) & (Kraptchev 21b).