Norwegian cavalry captain (rittmeister) and olympic equestrian (horserider, 1920 and 1928) <a href="https://en.wikipedia.org/wiki/Knut_Gysler" class="extiw" title="en:Knut Gysler">Knut Gysler</a> (1888–1967)
Unknown author<span style="display: none;">Unknown author</span>
CC BY-SA 3.0
Oslo Museum: image no. <a rel="nofollow" class="external text" href="http://www.oslobilder.no/OMU/OB.F05938b">OB.F05938b</a> (Byhistorisk samling/City historic collection), via oslobilder.no.