Dark Olive Green and Shades
Shipped to the Manila on February 3, 1938: 155,000

3.0 mm Spacing
Between O and B

3.7 mm Spacing
Between O and B
1940 MAY 18:
MANILA to ILOILO

Office of the President envelope endorsed VIA AIR MAIL, franked with 20c and pair of 2c Small Commonwealth O.B. for proper 24c triple domestic air rate, 60 grams maximum weight
(8c per 20 grams).

Uncommon Two O.B. Isssues Combination
1940 SEPTEMBER 25:
MANILA to WASHINGTON

U.S. Government registered official wrapper franked with 20c pair, postmarked by Bureau of Posts on September 28,
with red registry label added.
Backstamped WASHINGTON / OCT 18. 

The Bureau of Posts set the maximum weight for Third Class wrapper rate at 220 grams. The 40c postage therefore good for 16c quadruple rate at 4c per 55 grams (overpaid by 4c) plus 20c Registry Fee.