Marking in purple, measuring 36.0 mm x 5.0 mm
Used from 1928 to 1929

Addressed to New York, letter originating from Lumanao, Zamboanga.
Postmarked ZAMBOANGA, ZAMBOANGA, P.I. / FEB 9 1929.

This marking similar to the one employed in Cebu from 1929 to 1932
except for the broken "E" which is constant in the Zamboanga mark.

Boxed-in auxilliary marking also used in Davao.
 Marking in violet, measuring 46.5 mm x 6.5 mm
Used from 1931 to 1934

Addressed to Boston, letter originating from Dansalan, Lanao.
Postmarked ZAMBOANGA, ZAMBOANGA, P.I. / OCT 1 1934

Previously recorded as used from 1931 to 1932.