50 Pfenning local banknote (<a href="https://en.wikipedia.org/wiki/Notgeld" class="extiw" title="en:Notgeld">Notgeld</a>) issued by the City of Oldenburg  in 1921 depicting a guide dog
<a href="https://de.wikipedia.org/wiki/Verlag_Gerhard_Stalling" class="extiw" title="de:Verlag Gerhard Stalling">Verlag Gerhard Stalling</a>
<a href="https://de.wikipedia.org/wiki/Verlag_Gerhard_Stalling" class="extiw" title="de:Verlag Gerhard Stalling">Verlag Gerhard Stalling</a> (<a rel="nofollow" class="external autonumber" href="https://en.numista.com/catalogue/note221007.html">[1]</a>)