4 IRC of years 1952 to 1973, almost all overprinted and/or with additional postage due to change of rate, very nice group! (Image)

20 IRC of varied countries and periods (from 1938 to 1977), all different including some scarce countries, also a couple with overprints for change of rates(Japan and Spain), a few with defects, most of fine to excellent quality! (Image)