Issued by Netherlands (Nederland) as part of the famous Child Welfare (Kinderzegel) semi-postal series, this stamp highlights child safety and healthy outdoor activity through the image of a young swimmer. The additional +10 cent surcharge supported national child welfare and youth aid programs. Its minimalist blue photographic design reflects the modern social-theme style adopted in mid-20th-century Dutch issues. Kinderzegel stamps remain highly collectible for their humanitarian purpose and annual continuity. A strong thematic addition for welfare, youth, and social service collections.