Petar Darvingov and others

This is the back of F73k_op1_ae2271_v001. Text with pencil: "For a memorial to P. Darvingov". Town Sofia. 10,5 х 16 cm. Bulgarian language. Cardboard. Dirty. Moistened end dry. Original reference: BOX2; F73k_op1_ae2271_r001.