This Belgian semi-postal stamp pair features artwork inspired by the historic Orval Abbey, a renowned Cistercian monastery in Belgium. The design depicts a monk holding a liturgical candle beside a ceremonial cross, reflecting the spiritual craftsmanship summarized by the inscription “Orval – Ars Aurificis” (Art of the Goldsmith). Issued with surcharges (40c + 60c and 2F + 3.50F), the stamps helped support cultural or charitable initiatives while celebrating monastic artistic heritage. The contrasting brown and rose color varieties highlight the detailed religious imagery and engraving style. These stamps are valued by collectors interested in religious themes, Belgian monastic history, and semi-postal issues.