Now showing: Guinea Bissau - Postage stamps (1974 - 2018) - 1 stamps.
4. April WM: None Perforation: 12½ x 12¼
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![[The 40th Anniversary of I.C.A.O., type MO]](https://swmedia-4cd6.kxcdn.com/media/catalogue/Guinea-Bissau/Postage-stamps/MO-s.jpg)
![[The 40th Anniversary of I.C.A.O., type MP]](https://swmedia-4cd6.kxcdn.com/media/catalogue/Guinea-Bissau/Postage-stamps/MP-s.jpg)
![[The 40th Anniversary of I.C.A.O., type MQ]](https://swmedia-4cd6.kxcdn.com/media/catalogue/Guinea-Bissau/Postage-stamps/MQ-s.jpg)
