Now showing: Saudi Arabia - Postage stamps - 1973 - International Hydrological Decade - 1 stamps.
10. May WM: 2 Perforation: 14
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![[International Hydrological Decade, type SU]](https://swmedia-4cd6.kxcdn.com/media/catalogue/Saudi-Arabia/Postage-stamps/SU-s.jpg)
