Switzerland
Now showing: Switzerland - Postage stamps (1849 - 2025) - 1 stamps.
1982
International Water Quality Association
23. August WM: None Sheetsize: 50 Design: Werner Muhlemann Engraving: Courvoisier. S.A. Perforation: 11¾
![[International Water Quality Association, type AVG]](https://www.stampworld.com/media/catalogue/Switzerland/Postage-stamps/AVG-s.jpg)
