Banner of Langendiebach, district of <a href="https://en.wikipedia.org/wiki/Erlensee" class="extiw" title="w:Erlensee">Erlensee</a>, Hesse, Germany
<bdi><a href="https://www.wikidata.org/wiki/Q1600820" class="extiw" title="d:Q1600820"><span title="German heraldist">Heinz Ritt</span></a>
</bdi>
1953-02-28
Own work  using: <a rel="nofollow" class="external text" href="https://starweb.hessen.de/cache/STANZ/1953/00011.pdf#page=23">Genehmigung einer Flagge der Gemeinde Langendiebach</a>