17 JANUARY
1906: ZAMBOANGA, MINDANAO to MANILA. Pair of 3c Jacksons with black
O.B. for
proper postage
for 3 ounces weight on Constabulary official mail. Backstamped MANILA /
JAN 20.
21 FEBRUARY
1906: CAGAYAN, MINDANAO to MANILA. With 2c Washington 1899 issue for
1 ounce weight. Backstamped MANILA / FEB 28.