5c Kalayaan "O.B." Imperforate Franking
1944 MAY 22: PUERTO PRINCESA, PALAWAN to MANILA. Franked with 5c Kalayaan imperforate issue with typed "O.B." for proper single letter rate.

Puerto Princesa Post Office re-opened on December 21, 1942.

Typed "O.B." (Official Business) contrary to regulations as the Japanese
regulations stated that the "O.B." should have been "K.P."

VERY SCARCE ISSUE
EITHER OFFICIAL OR COMMERCIAL COVER