International reply coupon
In international mail traffic it is possible to send foreign correspondents the postage for a reply letter by an international reply coupon. On sale at post offices in many countries. The coupons must be changed to the value of the simple postal expenses for one letter to a foreign country.
In countries with a 'weak' currency the obtainability is often restricted.
Reply coupons are items for specialized collectors.
by Jan de Crom
taken from "The Postal Bee" 3/2000
Contact Group Bee Philately