Presumably this badge was worn by the Chairman of the Union at official meetings on the St. George's shoulder ribbon.
Union of Cavaliers of St. George Order /Union des chevaliers de l'ordre militaire Imperial Russe de St. George/ was founded in France on December 9, 1923. The first constituent meeting, at the initiative of the initiative group, took place in Paris on December 9, 1923, where the foundation of the Union was laid. The Union unites, for the purpose of mutual assistance, all cavaliers of the Order of St. George, the St. George Weapon, the St. George Cross and Medal.
The first Chairman of the Union was General Kalitin, the second Chairman was General Kaufman-Turkestansky, the third was General Count Grabbe, the fourth was General Stogov, the fifth was General Prince Bekovich-Cherkassky.
The external distinction of the members of the Union is the sign approved by the Board, worn in the buttonhole of a civilian suit, and for different categories of members it is different, namely:
1. For the cavaliers of the Order of St. George - a round rosette made from the order ribbon.
2. For the cavaliers of the St. George weapon - the same rosette, but from the combined ribbon of the St. George and St. Anna orders ribbons.
3. For cavaliers of the St. George cross or medal - a narrow order ribbon, sewn into the slit of the buttonhole of the left lapel.
The union has a seal with the image of St. George and an inscription around the circle in Russian and French: "Union of St. George Cavaliers".