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6 JANUARY 1906: DUMAGUETE, NEGROS ISLAND to MANILA Douuble rated Philippine Constabulary official mail with blue O.B. on 2c Washington 1903 issue. Backstamped MANILA / JAN 9. |
6 JULY 1906: TANAUAN, BATANGAS to MANILA Quadruple rated Philippine Constabulary official mail with blue O.B. on bottom pair of 2c orange red Washington 1899 booklet pane of 6. Backstamped CALAMBA, LAGUNA and MANILA on the same day. THE ONLY RECORDED BOOKLET PANE PAIR ON COVER |
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