First postage stamp of <a href="//commons.wikimedia.org/wiki/Czechoslovakia" class="mw-redirect" title="Czechoslovakia">Czechoslovakia</a>, Hradčany of <a href="//commons.wikimedia.org/wiki/Prague" class="mw-redirect" title="Prague">Prague</a>, 25 haléřů, dec. 1918
<bdi><a href="https://en.wikipedia.org/wiki/en:Alphonse_Mucha" class="extiw" title="w:en:Alphonse Mucha"><span title="Czechoslovak photographer, painter and illustrator (1860-1939)">Alphonse Mucha</span></a>
</bdi>
own collection