Now showing: Bulgaria - Postage stamps - 1971 - The 25th Anniversary of the UNESCO - 1 stamps.
4. November WM: None Perforation: 12½
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![[The 25th Anniversary of the UNESCO, type BUW]](https://swmedia-4cd6.kxcdn.com/media/catalogue/Bulgaria/Postage-stamps/BUW-s.jpg)
