The green and red airmail cover, sent from Mecca (Saudi Arabia) to Aden, where it received a machine receiving cancel. Saudis often use stamps across the seal of the envelope to guarantee privacy. Scott #161a, 168, and RA6//RA8, one of those 3 numbers on the "Secours" postal tax stamp.
The blue and red airmail cover, sent from Saudi Arabia to unknown country. Scott #515.
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