The envelope is addressed from Kronstadt to Moscow, to the Main Military Sanitary Directorate.
In 1918, due to a shortage of low-denomination postage stamps and the complete прекращение of deposits into savings banks because of the outbreak of the Civil War, savings stamps in denominations of 1, 5, and 10 kopecks began to be used as postage. The circulation of these stamps soon ceased on its own, since, as a result of the rapid падение of the paper-money exchange rate, postal тарифs kept rising, and low-denomination postage payment stamps fell out of use.
This continued until March 1920, when, to pay for postal items—given the ongoing decline in the value of money—stamps almost exclusively in ruble denominations were required.