10 APRIL 1906: ZAMBOANGA, MINDANAO to MANILA 9 centavos rated Constabulary official mail , 4-1/2 ounces weight, franked with 1901 brown 4c Lincoln with blue O.B. mixed with 1904 blue 5c Lincoln with red O.B. Backstamped MANILA / APR 15.

TIANONG, TAYABAS

VIGAN, ILOCOS SUR

BAGUIO, BENGUET

BACOLOD, NEGROS OCCIDENTAL

BAYOMBONG, NUEVA VIZCAYA

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