A commemorative 10-Pfennig stamp issued by Germany (Deutsche Bundespost) in 1964 marking the 100th anniversary of Philipp Reis’ pioneering telephone prototype. The design features a detailed technical illustration of Reis’ early telephonic apparatus, rendered in crisp engraved-style linework against a deep green field. This issue honors Reis’ role as one of the earliest inventors to successfully transmit sound electrically, predating Bell’s commercial telephone. Highly collectible for themes such as telecommunications history and scientific innovation, this is a classic mid-century German commemorative printed with precise typography and strong visual balance.