Airmail Covers

Quality: ✉

1937 N° 147 “5fr. green Stanley” and 191 (2x) “5fr. brown-black” 50th-anniversary stamp on a cover for an international postal money order sent from Stanleyville on 22 April 1937 to Brussels; as the item was postage-free, only the airmail rate was paid, i.e., “15fr.” with a handwritten note “25g./5p = 15” (charge effective 1 April 1937 of “3fr.” per 5gr.), a rare item, very fine