FDC made in the Soviet Union, 1976. The text on the envelope reads:”Academician S.G. Strumilin”. Stanislav Gustavovich Strumilin (1877-1974) was a Soviet economist and statistician. He played a leading role in the analysis of the planned economy of the Soviet type, including modeling, development of the five year plans and calculation of national income. His particular contributions include the “Strumilin index”, a measure of labor productivity, and the “norm coefficient”, relating to analysis of investment activity.