Date and photographer unknown. Akashi died in 1939, so it must have been taken before that. Presumably taken at <a href="https://en.wikipedia.org/wiki/Nagashima_Aiseien_Sanatorium" class="extiw" title="en:Nagashima Aiseien Sanatorium">en:Nagashima Aiseien Sanatorium</a>, where he was confined until his death.
Unknown author<span style="display: none;">Unknown author</span>
circa 1936?
<a rel="nofollow" class="external free" href="http://www.cscd.osaka-u.ac.jp/user/rosaldo/Kaijin_Akashi_1901-1939.html">http://www.cscd.osaka-u.ac.jp/user/rosaldo/Kaijin_Akashi_1901-1939.html</a>; according to <a rel="nofollow" class="external text" href="http://www.ifsa.jp/index.php?Gakashikaijin">this</a> the original is held at the <a href="https://en.wikipedia.org/wiki/Nagashima_Aiseien_Sanatorium" class="extiw" title="en:Nagashima Aiseien Sanatorium">Nagashima Aiseien Sanatorium museum</a> (<a rel="nofollow" class="external text" href="http://www.aisei-rekishikan.jp/index.php?lang=en">homepage</a>).