Scale for equivalence of heat and energy
56%
| Country: | Germany, Federal Republic |
|---|---|
| Issue: | 200th birthday of Julius Robert von Mayer |
| Date: | 2014-11-03 |
| Print: | Offset and Lithography |
| Perforation: | comb 13¾ |
| Emission: | Commemorative |
| Format: | Stamp |
| Face Value: | 90 Euro cent |