This is a lot of 7 Republique Du Burundi Stamps.
Three of these 1970s stamps commemorate the Belgian royalty's visit to Burundi (visite des souverains belges au Burundi), and the remaining four commemorate the fourth anniversary of the Republic of Burundi (4eme anniversaire de la republique du burundi).
They come in pre-owned condition, Mint Never Hinged, in a display sheet.