Airmail Covers

Quality: ✉

1937 N° 147 “5fr. green Stanley” and PA 2 “1fr. purple” airmail on an envelope for an international postal money order sent from Luluabourg on 23 April 1937 to Brussels; as the item was postage-free, only the airmail charge of “6fr.” was paid (rate effective 1 April 1937: “3fr.” per 5fr.), rare item, very fine