Issued in 1988 by the United Nations Postal Administration, this 25-cent stamp celebrates International Volunteer Day, an annual observance highlighting the invaluable service of volunteers worldwide. The design portrays a woman teacher, dressed in a traditional sari, instructing mathematics in front of a chalkboard — symbolizing education as an act of empowerment and service. Through this imagery, the UN honors volunteers who dedicate their time and skills to uplift communities, particularly in education and development sectors. A meaningful collectible that reflects the spirit of selfless contribution and global cooperation.