Sabena: First flight from Conakry to Brussels

Although similar first-day covers announcing mid-century Sabena services to West Africa have been featured from the earliest days of Timetablist, this particular item hasn't been posted before: Sabena's 1959 service from Conakry to Brussels, with a special envelope featuring the famous Hôtel de Ville next to a West African mask, with the Boeing Jet Intercontinental. An alarming Guinean serpent stamp occupies the upper right.