Now showing: Bulgaria - Postage stamps (1879 - 2024) - 1 stamps.
5. March WM: None Perforation: 11½
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![[Airmail - Soviet Mars-Probe "Mars 1", type ARO]](https://swmedia-4cd6.kxcdn.com/media/catalogue/Bulgaria/Postage-stamps/ARO-s.jpg)
![[Airmail - Soviet Mars-Probe "Mars 1", type ARP]](https://swmedia-4cd6.kxcdn.com/media/catalogue/Bulgaria/Postage-stamps/ARP-s.jpg)
