Observatory Sonnblick, 75th anniversary 1.80 öS — Austria, 1961
Observatory Sonnblick, 75th anniversary (Austria, 1961), face value 1.80 öS. Photo, catalogue value, details and photo identification.
- Issue date
- 1961
- Face value
- 1.80 öS
- Colors
- Violet blue
- Print run
- 2,973,000
- Yvert
- AT 931
- Michel
- AT 1091
- Stanley Gibbons
- AT 1369
- Scott
- AT 666