1956 Sc 1550I Kliment A. Timiryazev Scott 1581

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1956. Kliment A. Timiryazev.
Catalogs: Scott 1581, Standard Collection 1550I, Michel 1576.
Height: 33 mm.
Issued on: 1956.
Perforation: line 12½.
Printing: Photogravure.
Raster: square.
Face value: 40 Russian kopek.