Japanese men. In the center is Inaba Masami (a daimyō of Tateyama Domain during late-Edo period Japan). The other men from the right to the left side are: Ozeki Masuhiro, Matsudaira Tarō, Katsu Kaishu,  Ishikawa Jukei , Van Varuken Berg (US envoy), Ezure Akinori (foreign service).
<bdi><a href="https://en.wikipedia.org/wiki/en:Charles_Leander_Weed" class="extiw" title="w:en:Charles Leander Weed"><span title="American photographer">Charles Leander Weed</span></a>
</bdi>
The Japanese book "幕末・明治・大正 回顧八十年史" (Memories for 80 years, Bakumatsu, Meiji, Taisho), published by 東洋文化協會 (The Eastern Culture Association)