The Russian Empire. 1905-1917 . The badge of a member of the Union of the Russian People - "Black Hundreds".From wikipedia - The collective name of representatives of extreme right-wing organizations in Russia in 1905-1917, who spoke under the slogans of autocracy and Orthodoxy. Initially, they called themselves "truly Russian", "patriots" and "monarchists", but then quickly adapted the nickname "black hundred", raising its origin to the Nizhny Novgorod "black hundreds" of Kuzma Minin, who brought Russia out of the state of Troubles.
White metal, screw mount. Size 47*30 mm. The nut is lost..