Now showing: Sudan - Postage stamps (1897 - 2023) - 1 stamps.
14. February WM: None Perforation: 13½
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![[Association for the Promotion of Scientific Innovation, type IV]](https://www.stampworld.com/media/catalogue/Sudan/Postage-stamps/IV-s.jpg)
![[Association for the Promotion of Scientific Innovation, type IV1]](https://www.stampworld.com/media/catalogue/Sudan/Postage-stamps/IV1-s.jpg)
![[Association for the Promotion of Scientific Innovation, type IV2]](https://www.stampworld.com/media/catalogue/Sudan/Postage-stamps/IV2-s.jpg)
