Russia 3915a error

$ 14.60

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Russia 3915a error in date: 1964 instead of 1961, MNH, $20.00. Michel 3942-I, Euros 25.00. 1971. William Foster, 1881-1961, chairman of Communist party of US. View of New York. Block of 4 - buy 4 stamps (2, 1st block with corner margin).