<p><a href="//commons.wikimedia.org/wiki/Commons:Coat_of_Arms" class="mw-redirect" title="Commons:Coat of Arms">Coat of arms</a> of <a href="https://en.wikipedia.org/wiki/Alexander_Cambridge,_1st_Earl_of_Athlone" class="extiw" title="en:Alexander Cambridge, 1st Earl of Athlone">Alexander Cambridge, 1st Earl of Athlone</a> (1874-1957), third son of Prince Francis, Duke of Teck (a German nobleman), and Princess Mary Adelaide of Cambridge, daughter of Prince Adolphus, Duke of Cambridge (1774-1850), the youngest surviving son of King George III. Quarterly of 4 with <i>a crescent sable overall for difference</i> (usually of a second son):<br></p>
<ul><li>1&amp;4: Royal arms of Prince Adolphus, Duke of Cambridge (1774-1850), being arms of his father King George III with label for difference;</li>
<li>2&amp;3: Arms of Prince Francis, Duke of Teck</li></ul>
<a href="//commons.wikimedia.org/wiki/User:A1_Aardvark" title="User:A1 Aardvark">A1 Aardvark</a>
CC BY-SA 3.0
<p>SVG elements from
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<ul><li><a href="//commons.wikimedia.org/wiki/File:Mary_of_Teck_Arms.svg" title="File:Mary of Teck Arms.svg">Mary_of_Teck_Arms.svg</a></li>
<li><a href="//commons.wikimedia.org/wiki/File:Croissant_d_or.svg" title="File:Croissant d or.svg">Croissant_d_or.svg</a></li></ul>