<p>Stamp of the Republic of Germany - German Reichspost - definitive stamp, issue of 1920 in the drawing of the 1900 series; with black, standing oval ovewrprint of the Entente-commission<br><b>Stamp</b>: Michel: No. 27a <i>(= Michel No. 115b (1920-03) with overprint)</i>; Yvert &amp; Tellier, No. 27 (DR-AL 27); AFA: No. 27 (DR-AL)<br><i>(Genius with torch instead with crown; bottom inscription in Latin normal letters)</i><br><b>Color</b>: lilac red<br><b>Watermark</b>: Germany No. 1 (rhombs)<br><b>Nominal value</b>: 2,50 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><br><b>Postmark</b>: Bischofsburg, <time class="dtstart" datetime="1920-07-28" lang="en" dir="ltr" style="white-space:nowrap">28 July 1920</time><i>(= then Bischofsburg (then Regierungsbezirk Allenstein - Landkreis Rößel (Rößel-Bischofsburg) in the Ermland, East Prussia); contemporary the town <a href="//commons.wikimedia.org/wiki/Category:Biskupiec" title="Category:Biskupiec">Biskupiec</a> in Poland)</i>
Deutsche Reichspost - "Commission d'administration et de plébiscite Olsztyn - Allenstein"
scan of original