BULGARIA: 5 Leva (1979) in silver (0,500) commemorating the 100th Anniversary of the Communication Systems. National coat of arms above denomination on obverse. Radio tower within soundwaves, horn below divides dates on reverse. Inside slab by NGC "PF 64 ULTRA CAMEO / COMMUNICATIONS ANNIV.". Cert number: 6634253-020. (KM 103) & (Nikolov 130).