Response Viktor Pivovarov
Replied the author himself.
"Какой-то is symbolic in these small sketchbook next to the signature there. This is a special bonus for collectors is that each plate is its own way unique. If the image on the front side of the plate the same throughout the circulation, the pattern with the signature on the reverse of everywhere different. Motifs are sometimes repeated, but always a bit-чуть-другому".