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Hollow "O" and "B". With Square Instead of Dot or Period After "O" and "B". Semi Serif "B" Handstamped in Black or Blue Printer's Ink Used by the Philippine Constabulary in Manila and in the provinces of Laguna, Negros Occidental, Pangasinan, Sorsogon and Tayabas. 
Size: 13.0 x 4.5 mm |
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12 JANUARY 1906: MANILA CIRCULATING, Written from PILILLA, RIZAL and mailed in Manila, 2c Washington with manuscript OB, treated as 4c quadruple rate for 2 ounces weight charged 2c Dues (official mail without penalty) and paid with same issue with hollow type black O.B. THE EARLIEST RECORDED USAGE |
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