Anniversary of the birth of Hermann Von Helmholtz.

Aniversario del nacimiento de Hermann Von Helmholtz.
Ownerjosep colomer valls
ObservationsN? Cat Yvert 369value series.
CountryGermany
Colection
Face value25p.
Year1971
StateUsed
StatusExhibition - Non-transferable
CategoryVIP
FormatVertical
Other informationPerforated stamp
visualizations373