Airmail Covers

Quality: ✉

1937 PA 8 (2x) and PA 12 “1fr. carmine” and “5fr. brown-yellow” airmail stamps on an envelope for an international postal money order sent from Kabalo on 1 November 1937 to Brussels; as the item was postage-free, only the airmail charge of “7fr.” for 10gr. was paid. (rate in force until 31 March 1937: “3.50fr.” per 5gr.), rare item, very fine/fine