Issued in 1988, this modernist Belgian commemorative stamp celebrates 75 years of BCH (Belgisch Controlebureau voor de Huisvesting / Contrôle des Habitants), an important administrative service linked to Belgium’s national rail and passenger management. The design features a striking pixel-style mosaic in blue tones, symbolizing data, organization, and modern infrastructure. Bright red and yellow pixel accents add contrast, with the anniversary text “75 Jaar / Ans BCH” boldly highlighted below. A distinctive stamp for collectors of Belgian commemoratives, transportation themes, or abstract graphic design issues.