The 100th Anniversary of the Observatory on the Sonnblick 1986
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1986
The 100th Anniversary of the Observatory on the Sonnblick
5. september WM: Geen Ontwerp: Gerhart Schmirl y Otto Zeiller. Perforatie: 13¾ x 14½
![[The 100th Anniversary of the Observatory on the Sonnblick, type BAT]](https://www.stampworld.com/media/catalogue/Austria/Postage-stamps/BAT-s.jpg)
