Grand Duke Constantin Pavlovich (1778-1831), in general's uniform, red-piped black coat, gold-embroidered red collar, gold aiguillette and epaulettes, wearing the breast-star of the Imperial Russian Order of St. Andrew, the jewel and breast-star of St. George (2nd class), the Order of St. Vladimir, the Austrian Order of Maria Theresa, the Prussian Iron Cross, the Württemberg Military Merit (Knight class), the Bavarian Military Order of Max-Joseph, and medals including the 1812 Campaign; sky background
<p>signed and dated 'Benner 1818' (mid-right)
on card
</p>
oval, 5¼ in. (33 mm.) high, rectangular gilt-metal mount within giltwood panel
HENRI BENNER (FRENCH, 1776-after 1833)
1818
<a href="https://en.wikipedia.org/wiki/Christie%27s" class="extiw" title="en:Christie's">Christie's</a>, LotFinder:  entry  <a rel="nofollow" class="external text" href="https://www.christies.com/LotFinder/lot_details.aspx?intObjectID=5003430">5003430</a> (sale 7453, lot 202)