Germany
0.05 - 0.06$
price on 05.08.2022
Millenary of ore mining in Harz Mountains.
| Country: | Germany |
| Type: | Postage stamps |
| Series: | Scientific Anniversaries (3rd series) |
| Nominal: | 20 Pf. |
| Year: | 1968 |
| Material: | fluorescent |
| Size: | 28 x 33 mm |
| Perforation: | comb 13¾ x 14 |
| Mintage: | 95,000,000 |
Scientific Anniversaries (3rd series)
 Koenig Printing Press 0.06$ |  Ore Crystals 0.05$ |  Lens Refraction 0.1$ |