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13 SEPTEMBER 1906: MALOLOS, BULACAN to MANILA Bearing 15c Clay and 50c Jefferson both handstamped with vertical large bold O.B. in blue. Backstamped MANILA / SEP 15. THE ONLY RECORDED ISSUES WITH LARGE BOLD BLUE O.B. LATEST RECORDED USAGE OF THE MARKING |
6 JULY 1906: MANILA to MALOLOS, BULACAN 1 ounce double weight mail. Backstamped MALOLOS / JUL 14. THE ONLY RECORDED 2c WASHINGTON ON COVER WITH VERTICAL LARGE BOLD BLUE O.B. |
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