1906 SEPTEMBER 13: 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 TYPE II LARGE BLUE O.B. LATEST RECORDED USAGE 1906 JULY 6: MANILA to MALOLOS, BULACAN 1 ounce double weight mail. Backstamped MALOLOS / JUL 14. THE ONLY RECORDED 2c WASHINGTON ON COVER WITH VERTICAL TYPE II LARGE BLUE O.B.

Large O.B.

Blue-1

Blue-2

Blue-3

Blue-4

Blue-5

Blue-6

Blue-7

Red O.B.

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