Issued by Japan in 1971, this striking 15-yen commemorative stamp honors the Centenary of the Family Registration System (Koseki). The design features an expressive child's face rendered in soft pink tones, symbolizing identity, lineage, and the continuity of Japanese families. The large “100” forms a subtle backdrop, integrating the anniversary theme with modern graphic aesthetic. A popular item among collectors of social history, portrait art, and Japanese commemoratives, this stamp remains a distinctive example of early 1970s Japanese design.