The then Prince  <a href="https://en.wikipedia.org/wiki/Albert_I_of_Belgium" class="extiw" title="en:Albert I of Belgium">Albert of Belgium</a> congratulates baron <a href="https://nl.wikipedia.org/wiki/Pierre_de_Caters" class="extiw" title="nl:Pierre de Caters">Pierre de Caters</a>  at the Antwerp Aviation Week 23-10/2-11-1909.
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Postcard from Postcard collection <a href="//commons.wikimedia.org/wiki/User:Ad_Meskens" title="User:Ad Meskens">Ad Meskens</a>