Princess Antonia of Luxembourg
<bdi><a href="https://en.wikipedia.org/wiki/en:Franz_Grainer" class="extiw" title="w:en:Franz Grainer"><span title="Bavarian photographer (1871-1948)">Franz Grainer</span></a>
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<p><b>Original publication</b>: Published as a postcard in Europe.<br></p>
<b>Immediate source</b>: Private Collection – Wartenberg Trust