Watch List notes:

BULGARIA: 20 Leva (1988) in silver (0,500) commemorating the 110th Anniversary of Liberation. Monument above denomination and date at right on obverse. Liberation celebration and date below on reverse. Inside slab by NGC "PF 68 ULTRA CAMEO / LIBERATION ANNIVERSARY". Cert number: 6389132-099. (KM 172) & (Nikolov 218).