Coat of arms of Dukes of Leuchtenberg in Russia (morganatic descent of Nicholas Maximilianovitch). Helmless version. Sources : 
File:Leyht-gerb.jpg
File:Leyht-gerb-1.jpg
File:Leihtenberg COA.jpg
Own work, some elements by by sodacan &amp; Katepanomegas..

http://gerbovnik.ru/arms/2470.html
Yves