Series "20th anniversary of the death of naturalist k. A. Timiryazev": k. Timiryazev agricultural academy in moscow, black and blue. Phototype on paper, without watermark, perforated: linear perforation 12½ (for every 2 centimeters of the stamp edge there are 12½ teeth). There are no official varieties. Stamp sheets contain 100 (10×10) copies.
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