The Duchess of Alba's signature
<a href="//commons.wikimedia.org/wiki/User:Barbudo_Barbudo" title="User:Barbudo Barbudo">Barbudo Barbudo</a>
Traced in Inkscape from <a rel="nofollow" class="external free" href="http://maratania.es/wp-content/uploads/2015/10/Carta-de-la-duquesa-de-Alba-e1453369040162.jpg">http://maratania.es/wp-content/uploads/2015/10/Carta-de-la-duquesa-de-Alba-e1453369040162.jpg</a>