<p>Official stamp of the German Empire for the plebiscite area of Upper Silesia = Official Stamp of the German Empire with black, single-line, traverse overprint "C.G.H.S." (= for "<b>C</b>ommission interallié de <b>G</b>ouvernement - <b>H</b>aute <b>S</b>ilesie"); official stamp with "Ablösenummer" "21" <i>(21 = for Prussia)</i><br><b>Stamp</b>: Michel No. D5 <i>(= German Empire, Michel No. D20 from 1920 with overprint)</i>;  Yvert &amp; Tellier: No. S5 (DR-OS)<br><b>Color</b>: redorange on reddish light chrome yellow<br><b>Watermark</b>: Germany No. 1 (rhombs)<br><b>Nominal value</b>: 30 (Pfennig)<br></p>
<b>Postage validity</b>: from April 1920 until 1 October 1923 <div style="display: none;">date QS:P,+1920-00-00T00:00:00Z/8,P580,+1920-04-00T00:00:00Z/10,P582,+1923-10-01T00:00:00Z/11</div><br><i>(Also after withdrawal of the Entente military could be continued to use the official stamps for Upper Silesia until exhaustion. But from 01 Oct 1923 onwards, the German offices have not more used official stamps in the frame of the "Ablöseverfahren".)</i>
"Commission interallié de gouvernement - Haute Silesie"
scan of original