The signature of the second governor of Portuguese India, Afonso de Albuquerque. 
<p>It reads: "Aº dalbuqq". Digitally traced from <a rel="nofollow" class="external free" href="http://nova-acropole.pt/images/images/afonso3.jpg">http://nova-acropole.pt/images/images/afonso3.jpg</a>.
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The full signature reads: <i>Feytura e servyço de Sua Alteza, Afonso de Albuquerque</i> (In Your Higness' service, Afonso de Albuquerque)
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<span class="int-own-work" lang="en">Own work</span>