1939 FEBRUARY 28:
MANILA to WASHINGTON

From Commonwealrth of the Philippines National Assembly,
addressed to Sergio Osmena,
Philippine Commissioner to the U.S., franked with 20c x 2 and 30c x 2
O.B. issues for proper 1 peso single Air Mail Rate as endorsed, via Boeing Clipper First Flight to the U.S.
1936 FEBRUARY 7: MANILA to WASHINGTON
From the U.S. Military Adviser in the Philippines, endorsed "Air Mail" but dispatched by surface mail due to insufficient postage.

Franked with 2c block of 6 and 20c O.B. issues for proper 12c Double Outbound Registered Rate to the U.S., 60 grams maximum weight. Backstamped SEATTLE March 11. For some reason it took close to two months to reach WASHINGTON, backstamped May 3.