BULGARIA: 5 Leva (1988) in copper-nickel commemorating the Childrens Assembly. Denomination and date divides bell and logo within inner circle on obverse. Child with birds within circle on reverse. Inside slab by NGC "PF 69 ULTRA CAMEO / 4TH CHILDRENS ASSEMBLY". Cert number: 6389132-077. (KM 170) & (Nikolov 211).