Now showing: Bulgaria - Postage stamps (1879 - 2024) - 1 stamps.
10. October WM: None Perforation: 11
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![[International Letter Week, type AIT]](https://swmedia-4cd6.kxcdn.com/media/catalogue/Bulgaria/Postage-stamps/AIT-s.jpg)
![[International Letter Week, type AIU]](https://swmedia-4cd6.kxcdn.com/media/catalogue/Bulgaria/Postage-stamps/AIU-s.jpg)
