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17 JULY 1906: MANILA to CONSTANTINE, MICHIGAN, Blue O.B. on 1903 2c Washington carmine on oriental buff pse for proper single outbound rate to the U.S. Backstamped CONSTANTINE / AUG 24. |
 MALOLOS, BULACAN to MANILA, 1c Franklin green on blue 1903 postal envelope with blue O.B. on the indicia. Backstamped MANILA the next day THE ONLY RECORDED BLUE O.B. ON 1c GREEN ON BLUE PSE LESS THAN 5 EXAMPLES REPORTED FOR EACH 2c ENVELOPE LATEST RECORDED USE OF TYPE I BLUE O.B. |
17 JULY 1906: MANILA to CONSTANTINE, MICHIGAN, Blue O.B. on 1903 2c Washington carmine on oriental buff pse for proper single outbound rate to the U.S. Backstamped CONSTANTINE / AUG 24. |
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