Unidentified persons

This is the back of F73k_op1_ae2766_v001. Decorative printed back. Firm logo – photo studio "S.M. Popov". Town Sofia. 10,5 x 16,5 cm. Bulgarian language. Cardboard. Torn edges of the picture. patches of moisture. Original reference: BOX3; F73k_op1_ae2766_r001.