Harbour Authorities' flag in Free City of Danzig
<a href="//commons.wikimedia.org/wiki/User:Sodacan" title="User:Sodacan">Sodacan</a>
Own work  using: <a rel="nofollow" class="external autonumber" href="https://www.fotw.info/flags/de-dz~ha.html">[1]</a> <a rel="nofollow" class="external autonumber" href="https://www.danzig.org/en/wp-gallery/358/wp-gallery/?cat_id=772&amp;gallery-img-id=12913">[2]</a> <a rel="nofollow" class="external autonumber" href="https://www.ebay.pl/itm/193549576025?hash=item2d10742759:g:1e8AAOSwuEhe~qrd">[3]</a>