30 APRIL 1906: TARLAC, TARLAC to MANILA Constabulary official mail with 1c Franklin with red O.B, 1/2 ounce maximum weight. Backstamped MANILA on the same day. EARLIEST RECORDED USE 26 JUNE 1906: VIGAN, ILOCOS SUR to MANILA 3c Jackson issue of 1899 with red O.B. paying for the required 1-1/2 ounces weight Constabulary official mail. Arrival entry of July 19 on verso. NO MINT EXAMPLE REPORTED OF 3c JACKSON WITH RED O.B.

Large O.B.

Red-1

Red-2

Red-3

Red-4

Red-5

Red-6

Red-7

Red-8

Red-9

Blue O.B.

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