GERMANY, DDR - CIRCA 1980 : a postage stamp from Germany, GDR showing a microscope by Giovanni Battista Amici; Modena (1845). in the Optical Museum of the Carl Zeiss Foundation, Jena Stock Photo | Adobe Stock
Datei:Stamps of Germany (DDR) 1965, MiNr 1132.jpg – Wikipedia
Kleinmikroskop „C“ - Vorstellung und Reinigung
Microscope World Blog: Antique Microscope Stamps
altes schweres DDR CARL ZEISS JENA Forschungsmikroskop, Stereomikroskop 8 Kg | eBay