Accompanying address to valuable parcel on 100 roubles, sent from Petrograd to Riga (the Soviet Latvia) on March 29, 1919. It was received on April 2, 1919, handed to receiver on April 3, 1919. Form is franked with RSFSR stamp 70 k. "arm with a sword".
Very rare sending in Soviet Latvia (December 4, 1918 - July 1, 1919).