Stamp from the series on the Leipzig Spring Trade Fair in 1950. Commemorates first porcelain on the trade fair in 1710.
Cachet and stamp depict Max Planck, while the postmark is of Otto Lilienthal, who pioneered the use of gliders. Stamp is part of series, "Men from the History of Berlin."
Stamp depicts Georgius Agricola (1494-1555), who is perhaps best known as the "father of minerology" and for his work De re metallica [On the Nature of Metals].
Stamp depicts August Kekule with the chemical structure of a benzene ring.