Airmail Covers

Quality: ✉

1937 PA 5 “15fr. sepia” and PA 10 “3fr. reddish-brown” on a cover for an international money order sent from Leopoldville on 30 April 1937 to Brussels, with a handwritten notation “30gr.”, as the item was postage-free, only the local postage was paid, i.e., “18fr.” (charge: 3fr./5gr.), a rare item, to be checked