This Belgian 14-franc commemorative stamp, issued in 1991, marks the centenary of Rerum Novarum, the landmark papal encyclical promulgated by Pope Leo XIII in 1891. The document laid the foundation for modern Catholic social teaching, addressing the rights and duties of capital and labor during the Industrial Age.

The design is strikingly modern, with three overlapping color panels—green, red, and blue—representing continuity across a century of social thought. The text “100 Ans / Jaar” highlights the bilingual heritage of Belgium, and the ecclesiastical coat of arms appears at the upper left.

This issue stands out for its minimalist aesthetic and deep historical resonance, linking faith, labor, and justice across time.