<i>Ni mai dou</i>, a Japanese (samurai) chest armor showing the hinge on the left side making this a <i>ni mai</i> dou as opposed to a <i>maru dou</i> which has no hinge.
<a href="//commons.wikimedia.org/wiki/User:Samuraiantiqueworld" class="mw-redirect" title="User:Samuraiantiqueworld">Samuraiantiqueworld</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>