Los-Nr. 531

October 1918 German-occupied Minsk to Moscow, ordinary commercial letter with Warsaw and Moscow censors on front and 20 Pf Germania on reverse together with 60 Pf control stamp of the 10th Army both with Imperial Russian KOIDANOVO MINSK cancels further tied by Moscow machine cancel , very fine non-philatelic use on mail enabled by the Treaty of Brest-Litovsk