100th anniversary of Carl Zeiss' death, 20 mark coin 1988, GDR

On the 100th anniversary of Carl Zeiss' death, a 20-mark coin appeared in the GDR in 1988. It was minted from 625 silver and weighs 20.9 g.
On November 17, 1846, the mechanic Carl Zeis (1816 - 1888) founded the company of the same name in Jena for the manufacture and sale of mechanical and optical instruments. From 1847 the Carl Zeiss company also produced microscopes.