(International Reply Coupon) 1930s 40c in imperforate block of four very fine unused
1930 Inernational Reply Coupon imperforate proof block of four fine unused, ex King Farouk, probably unique.
1947 International Reply Coupon imperforate proof block of four fine unused, unique example in private hands, presented to Eugene Thomas at the 1947 U.P.U. Congress in Paris.