<p>Stamp of the German Empire - plebiscite area "Allenstein", definitive stamp, Reichspostamt-issue from 1920-03 (with flags on the side towers) with black, standing oval ovewrprint of the Entente-commission<br><b>Stamp</b>: Michel: No. 26 <i>(= Michel No. 114a (1920-03) with overprint)</i>; Yvert &amp; Tellier: No. 26 (DR-AL); AFA: No. 26 (DR-AL)<br><i>(Reichspostamt with flags on the side towers)</i><br><b>Color</b>: yellowbrown to orangebrown (or brownorange)<br><b>Watermark</b>: Germany No. 1 (rhombs)<br><b>Nominal value</b>: 1,50 Mark<br></p>
<b>Postage validity</b>: from March 1920 until 20 August 1920 <div style="display: none;">date QS:P,+1920-00-00T00:00:00Z/9,P580,+1920-03-00T00:00:00Z/10,P582,+1920-08-20T00:00:00Z/11</div>
Deutsche Reichspost - "Commission d'administration et de plébiscite Olsztyn - Allenstein"
scan of original