Antique Japanese iron <a href="https://en.wikipedia.org/wiki/kaginawa" class="extiw" title="wikipedia:kaginawa"><i>kaginawa</i></a> climbing hook.
<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>