The 75th Anniversary of Sonnblick Observatory 1961
Visar nu: Österrike - Postfrimärken - 1961 - The 75th Anniversary of Sonnblick Observatory - 1 frimärken.
1961
The 75th Anniversary of Sonnblick Observatory
1. september WM: Inga Design: H. Ranzoni D.J. Perforering: 14½ x 13¾
![[The 75th Anniversary of Sonnblick Observatory, Typ XS]](https://www.stampworld.com/media/catalogue/Austria/Postage-stamps/XS-s.jpg)