Stamp of denmark; 1920; commemorative stamp of the issue to the "incorporation of northern schleswig to the state area of denmark"; drawing of the castle of sønderborg; postmarked
stamp: michel: no. 111; yvert & tellier: no. 124; afa: no. 113; scott: no. 157
color: blue to slate blue
watermark: denmark no. 2 (crosses)
nominal value: 20 øre
postage validity: from 5 october 1920 until 31 december 1926
stamp picrture size (printed area): 20 x 17 mm. Date: 5 October 1920 (first issue day of the stamp).
