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1913 MAY 13: BAGUIO, MOUNTAIN PROVINCE to MANILA 4c McKinley and 10c Lawton with black OB on 4c McKinley carmine on amber size 7 Constabulary postal envelope for proper 18c Single Domestic Registered Rate (2c + 16c). |
1912 APRIL 2: BAGUIO, MOUNTAIN PROVINCE to WASHINGTON 4c McKinley with black OB on 4c McKinley carmine on amber size 9 Constabulary postal envelope for proper 8c Single Outbound Rate. |
1912 APRIL 12: ILAGAN, ISABELA to MANILA Bearing 4c McKinley x 6 for 24c quadruple registered rate. LARGEST RECORDED USE OF 1911 4c McKINLEY BLACK OB |
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