Signature of <a href="https://en.wikipedia.org/wiki/es:Calixto_Oyuela" class="extiw" title="w:es:Calixto Oyuela">Calixto Oyuela</a> (1857 - 1935), an Argentine writer and poet.
<a rel="nofollow" class="external text" href="https://archive.org/stream/argentinesoftoda01parkuoft#page/n589/mode/2up"><i>Argentines of To-Day</i> (1920)</a>, William Belmont Parker