Issued in 1967 by Belgium, this striking miniature sheet commemorates "POSTPHILA" — a philatelic promotion initiative by the Belgian postal administration. The central 10F + 5F stamp features a stylized design of dynamic postal lines converging at the "Pro-Post" logo, symbolizing the modern postal network. The additional 5F surtax supported philatelic activities. Surrounding the stamp are inscriptions in Dutch ("Bestuur der Posterijen") and French ("Administration des Postes"), highlighting Belgium’s bilingual heritage. The border is adorned with repeated “PP” emblems, reinforcing the postal theme.