1941 JULY 2: ZAMBALES CIRCULATING Provincial Treasurer official mail from IBA to SUBIC franked with 4c O.B. for proper Double First Class Domestic Rate, 40 grams maximum weight.

1940 DECEMBER 18: OROQUIETA, MISAMIS OCCIDENTAL to MANILA Provincial Treasurer official mail with 4c O.B. for proper Double First Class Domestic Rate, 40 grams maximum weight.