DBPB_1971_401_Hermann_von_Helmholtz.jpg
Source: Wikimedia Commons
  • Colnect-155-174-Hermann-von-Helmholtz-1821-1894.jpg
Issued by: Berlin
Function: postage
Date: 8/27/1971
Issue: Hermann von Helmholtz 150th
Denom: 25pf
Color: blue & multicolored
Design: Hermann von Helmholtz
Watermark: unwmk
Perf:
Catalog value:

In collections: unused (Stan Shebs)

External links:
Colnect 40624-.._von_Helmholtz