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18 DECEMBER 1906: BULACAN to MANILA 10c rated Constabulary official mail with 1c, 2c, 3c and 4c issues of 1903-04, handstamped with purple O.B. Backstamped MANILA / DEC 19. |
5 MARCH 1907: SAN ISIDRO, NUEVA ECIJA to MANILA Registered with 15c Clay O.B. (7c postage + 8c Registry Fee). Received MANILA the next day. LATEST RECORDED USE OF TYPE I PURPLE O.B. |
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