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common1945-1980
Professor Knöll Commemorative
East Germany · 1972 · 20 Pfennig
The stamp features a portrait of Professor Rudolf Knöll, a German microbiologist, with 'DDR' and '20' for the denomination.
This stamp commemorates Professor Rudolf Knöll (1883-1959), a distinguished German microbiologist, recognizing his significant contributions to science.
Printing Method
Offset
Image: Deutsche Post der DDR · License: Public domain
View on Wikimedia Commons
