Issued by Christmas Island (Indian Ocean) in 1979, this beautiful set honors Sir Rowland Hill (1795–1879), the reformer credited with creating the modern postal system. Each 20-cent stamp pairs his portrait with a different earlier issue of Christmas Island stamps, symbolizing the evolution of mail service and philately. The featured designs include the 2c Queen Elizabeth II definitive, 4c triggerfish, 5c Christmas angel, 10c ANZAC issue, and 2c island map, making this an elegant tribute to postal innovation and design heritage. A must-have for collectors of Commonwealth and thematic postal history issues.