Issued in 1967, this Belgian semi-postal set features lifelike portraits of three beloved zoo animals — the Giraffe (2.50 F + 1 F), the Eland (6 F + 2 F), and the Red Panda (3 F + 1 F). The clean modernist design, strong color backgrounds, and soft-toned renderings exemplify Belgium’s refined wildlife stamp art of the 1960s. Proceeds from the added surtax (+ F values) supported zoological and welfare causes, making these both beautiful and charitable issues. A favorite among animal-thematic collectors and a fine example of mid-century Belgian engraving.