A letter arrived today from Antwerp, with more South African stamps inside.

Issued 1993, Oct.18
Perf. 11½| Photogravure
1508 Air Hostess Natacha, by François Walthéry| 15fr | multi-colored
[Source: 2018 Scott Standard Postage Stamp Catalogue, Vol. 1B]
From Wikipedia: Natacha is a Belgian comics series, created by François Walthéry and Roland Goossens. The series tells the adventures of Natacha, a young sexy flight attendant in the service of the flight company Bardaf, and her clumsy, hot-tempered colleague and friend Walter, with occasional participation by her flight captain Turbo and his co-pilot Legrain. Natacha was first published in the Franco-Belgian comics magazine Spirou on February 26, 1970.
Belgian Railways 175th Anniversary
Issued 2010, May 10
Perf. 11½| Photogravure & Engraving
2438 Belgian Railways 175th Anniversary| €1.18 | multi-colored
[Source: 2018 Scott Standard Postage Stamp Catalogue, Vol. 1B]