Observatory Sonnblick, 75th anniversary
93%
| Country: | Austria |
|---|---|
| Issue: | Sonnblick Observatory |
| Date: | 1961-09-01 |
| Print: | Recess |
| Size: | 30 x 39 |
| Perforation: | comb 14½ x 13¾ |
| Emission: | Commemorative |
| Format: | Stamp |
| Face Value: | 1.80 Austrian schilling |
| Print run: | 2973000 |