16 MARCH 1906: MANILA to WASHINGTON, D.C.
Bureau of Customs and Immigration registered official mail franked with 8c Martha Washington
with black O.B. and 2c x 2 Washington with purple O.B. for quadruple registered rate,
2 ounces weight (4c + 8c registry fee). Tied with MANILA oval cancels
and red registry postmark on the side. WASHINGTON / APR 24 arrival on verso.

8 JANUARY 1906: SANTA CRUZ, LAGUNA to MANILA
Constabulary official mail, 2-1/2 ounces weight, paid with large black O.B. on 5c Grant 1899 issue.
Backstamped MANILA on the same day.

THE EARLIEST RECORDED USE OF THE LARGE O.B. 

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