This charming 1966 Belgium (Belgique / België) semi-postal charity stamp set highlights joyful childhood activities, featuring illustrations of children playing with a ball, blowing bubbles, and skipping rope. Issued with surtax denominations (1F+1F, 2F+1F, 3F+1.50F), the additional postal tax supported social and child welfare initiatives, a tradition common in Belgian charity issues. The soft pastel color palette and delicate engraved artwork give the set strong visual appeal for thematic collectors focusing on children, social welfare, or European semi-postal issues. Complete sets in well-centered mint condition are especially desirable for mid-1960s Belgian commemorative collections.