The 100th Anniversary of the PTT Union 1991
Now showing: Switzerland - Postage stamps - 1991 - The 100th Anniversary of the PTT Union - 1 stamps.
1991
The 100th Anniversary of the PTT Union
10. September WM: None Sheetsize: 50 Design: René Mühlemann. Engraving: Courvoisier. S.A. Perforation: 11¾
![[The 100th Anniversary of the PTT Union, type BDS]](https://www.stampworld.com/media/catalogue/Switzerland/Postage-stamps/BDS-s.jpg)
