 
1c Franklin
INVERTED
O.B. - ONLY REPORTED MINT EXAMPLE
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3c Jackson,
1899 Issue
Cancelled
SURIGAO / MINDANAO ISLD / JUL 25
THE ONLY
TWO STAMP ISSUES WITH RED BLOCK O.B.
NO MINT
EXAMPLES REPORTED TO EXIST
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30 SEPTEMBER
1906: TARLAC, TARLAC to MANILA
5c U. Grant
blue on white 1901 postal envelope with red Type I large O.B.
Backstamped
MANILA / OCT 1.
O.B. ON
POSTAL STATIONERY EXTREMELY SCARCE
THE LATEST
RECORDED USE OF RED BLOCK O.B.
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