The booklet is postal.Ri.1913. Series "Standard Issue".Issue of St. Petersburg Post Office.78 kopecks.Standard collection No. B6...

The booklet is postal.Ri.1913. Series "Standard Issue".Issue of St. Petersburg Post Office.78 kopecks.Standard collection No. B6 (handwritten text. "No. 4" on the back of the booklet).The paper is dense (pink-orange), coated paper (white), printing printing (color).100x52.- -.-Horizontal windows GKP-40173..Electronic copy source: PB