Accompanying address to parcel on 100 roubles, sent from Petrograd to Riga (The Soviet Latvia) on April 17, 1919. It was received on April 21, 1919, handed to receiver on April 23, 1919. Form is franked with one RSFSR stamp 70 k. "arm with a sword". Very rare sending in Soviet Latvia (December 4, 1918 - July 1, 1919).