Max Planck Commemorative Stamp

Germany · 1968 · 20 Pfennig

A brown stamp featuring a left-facing portrait of the German theoretical physicist Max Planck, with 'DEUTSCHE BUNDESPOST' and '20' at the bottom.

This stamp commemorates Max Planck, a German theoretical physicist whose discovery of energy quanta won him the Nobel Prize in Physics in 1918, marking a fundamental turning point in physics.