50 Pfennig <a href="https://en.wikipedia.org/wiki/Notgeld" class="extiw" title="en:Notgeld">"Notgeld" banknote</a> of <a href="https://en.wikipedia.org/wiki/Bielefeld" class="extiw" title="en:Bielefeld">Bielefeld</a>, size: 51 mm x 80 mm.
Issued by the City of Bielefeld, reproduced from an original banknote by <a href="//commons.wikimedia.org/wiki/User:Palauenc05" title="User:Palauenc05">Palauenc05</a>
1918-04-01
Private archive.