1972年シリーズコイル切手（封書20円時期）≪1972年（昭和47年）～1979年（昭和54年）≫ １９６０年及1970年代は日本の高度経済成長に伴う物価の値上がりによって、郵便料金も同年２月の国内向郵便料金と７月の外国郵便料金値上げとなり、上記自動販売機用コイル切手が２種発行された。
1972's Series Coil Stamps Issued on 1972 (Showa 47) - 1979 (Showa 54) In the 1960s and 1970s, due to the rise in prices accompanying Japan's high economic growth, postage was also raised in February of the same year for domestic use and in July for foreign postage. Therefore, two types of coil stamps for vending machines were issued.