People also ask
Do international reply coupons still exist?
What is the international reply coupon?
How to buy international reply coupons?
How much do international reply coupons cost?
International reply coupon
An international reply coupon is a coupon that can be exchanged for one or more postage stamps representing the minimum postage for an unregistered priority airmail letter of up to twenty grams sent to another Universal Postal Union member... Wikipedia
International Reply-Paid Coupon is used when you do not wish to have the addressee pay the return postage.