Now showing: Switzerland - Postage stamps (1980 - 1989) - 1 stamps.
1988
The 50th Anniversary of Pro Aero Foundation
8. March WM: None Design: Hans Hartmann. Engraving: Courvoisier. S.A. Perforation: 11¾
![[The 50th Anniversary of Pro Aero Foundation, type BAL]](https://swmedia-4cd6.kxcdn.com/media/market/1226/6409054-s.jpg)
