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21 AUGUST 1906: MANILA CIRCULATING Official mail from the Bureau of Science. Double rated, 1 ounce weight, with 2c carmine 1904 Washington, blue O.B. handstamp. THE ONLY RECORDED BUREAU OF SCIENCE COVER WITH BLUE BLOCK O.B. |
3 AUGUST 1906: TARLAC, TARLAC to MANILA With pair of 2c Washington with large blue O.B. mixed with 1c x 3 Franklin with small blue “O.B.” for 7c multiple rate, 3-1/2 ounces weight. Backstamped MANILA on the same day. |
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