Union of Soviet Socialist Republics (USSR); Workers' and Peasants' Red Army (WPRA); rank insignia 1924-1935 as to the order of the Revolutionary Military Soviet of the USSR Nr. 1244 from October, 1924; here small collar patch (raspberry-coloured with black piping) to tunic: 
Higher command level, service categories C7 – C9 (infantry and generally other army units and facilities):
C7/ OF-3 battalion commander and equivalents
battalion commissar.
Own work