Flag of <a href="https://en.wikipedia.org/wiki/Nagasaki" class="extiw" title="w:Nagasaki">Nagasaki</a>, Nagasaki
<a href="//commons.wikimedia.org/wiki/User:Alex_Tora" class="mw-redirect" title="User:Alex Tora">Alex Tora</a>
The flag uses the municipal symbol announced on <a rel="nofollow" class="external text" href="http://www1.city.nagasaki.nagasaki.jp/reiki/reiki_honbun/aq30200091.html">May, 1900</a>.