Blue printing block sampler, cardboard double-sheet printed on 4 sides with a blue pattern. 1st side: the printed area horizontally divided into two fields – upper: a pattern closer to an indistinct decor composed of groups of small dots sporadically complemented by a thick dot. Number 523 pasted on the top right. – lower: subtle small swirling motifs with indicated flowers and leaves. Number 524 pasted on the right. 2nd side: the printed area horizontally divided into two fields – upper: strips of double dots in a horizontal arrangement. Number 525 pasted on the top left. – lower: composition of short wavy vertical lines. Number 526 pasted on the left. 3rd side: the printed area horizontally divided into two fields – upper: a network of curves with triple dots. Number 527 pasted on the right. – lower: freely in space, a network of finely dotted swirls in diagonal stripes. At the intersections, five small arches stacked on top of each other. Number 528 pasted on the right. 4th side: a tiny ornamental motif composed of blue dotted stems and leaves, with small balls instead of flowers, covering the entire area. The ornament is denser at the bottom than at the top. Number 529 pasted on the top left, and number 530 pasted on the bottom left corner.