PHILIPPINE CONSTABULARY
4 CENTAVOS OFFICIAL POSTAL ENVELOPES FORM 3 CORNER CARD
4c William McKinley Carmine on Blue Laid Paper
Size 13, Knife 83, Watermark 15, Corner Card in Dark Blue

1910 MARCH 24: MANILA to ATLANTA, GEORGIA

 THE EARLIEST RECORDED USE
Previous ERU: September 20, 1910

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OFFICIAL STAMPS
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O1 - 04 1925 LEGISLATIVE PALACE OFFICIALS FDC
O17 1935 6c LA FILIPINA WITH DOUBLE O.B. - GENUINE OR FAKE?
O25 - EO1a VARIOUS OVERPRINTING ERRORS
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DEPARTMENT MAIL
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1898 & 1911 WAR DEPARTMENT OFFICIAL MAIL
1900 NOVEMBER 21 1900 "U.S. GOV'T EMPLOYEE'S MAIL" ENDORSED MAIL TO U.S.
1901 SEPTEMBER 6 WAR DEPT. MANILA TO WASHINGTON WITH 10c WEBSTER TYPE II BOTTOM MARGIN PLATE STRIP OF 3
1904 MAY 11 ETHNOLOGICAL SURVEY REPLY CARD USED BOTH WAYS
1904 4 COLORS MANUSCRIPT "OB" OFFICIAL MAIL
1907 JANUARY 24 ILOILO TO MANILA STAMPLESS VIA PAQUEBOT + CHARGED DUES
1907 MAY 11 LARGE RED O.B. INSIDE OVAL ON 2c & 4c
1909 APRIL 24 BUREAU OF EDUCATION OFFICIAL MAIL  WITH 1906 BOOKLET PANE AND 2/3 PANE
1918 JULY BUREAU OF AUDIT OFFICIAL MAIL WITH CENSORS 1801 & 1804
1927 SEPTEMBER TAGLE OVAL "OFFICIAL BUSINESS" COVER
1935 JUN 22 BALIWAG TO MALOLOS, BULACAN: RIZAL O.B. NO PERIOD AFTER "B" ERROR
1938 - 1941 OFFICE OF THE PRESIDENT & EDUCATION: MANILA TO BULACAN OFFICIAL MAIL
1939 - 1940 BUREAU OF EDUCATION: MANILA TO BULACAN OFFICIAL MAIL
1940 - 1941 BUREAU OF EDUCATION: MANILA TO BULACAN OFFICIAL
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PHIL. CONSTABULARY
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237 $1 FARRAGUT WITH RED BANDHOLTZ "OB" OVERPRINT
1904 OCTOBER 19 SORSOGON TO MANILA POSTALLY SEALED COVER
1906 JUNE 5 MALOLOS, BULACAN TO MANILA  4 COLORS REGISTERED COVER
1906 SEPTEMBER 8 FIRST DAY USAGE 1906 DEFINITIVES HANDSTAMPED O.B.
1906 DECEMBER 10 MALOLOS, BULACAN TO MANILA WITH BLUE BANDHOLTZ OB ON 8c OVERPRINT
1906 HANDSTAMPED TYPES VI & VII LARGE O.B. ON #E1 SPECIAL DELIVERY
1907 APRIL 1 ALBAY TO MANILA WITH RED BANDHOLTZ OB ON 15c OVERPRINT
1907 OCTOBER 7 VERY SCARCE DAGUPAN NORTH RPO POSTMARK ON CONSTABULARY MAIL
1908 - 1910 OFFICIAL ENVELOPES PROPERLY UPRATED DOMESTIC USE AND TO U.S.
1910 MARCH 24 NEW ERU OF UPSS #OB29 PHIL CONSTABULARY 4c POSTAL ENVELOPE
1910 APRIL 18 EDU OF UPSS #OB28 2c RIZAL GREEN ON BLUE OFFICIAL ENVELOPE
1910 - 1913 UPSS #OB2 AND #OB40 2c RIZAL GREEN ON BLUE ENVELOPES
1910 - 1913 PSS #OB19-20 AND #OB25 2C RIZAL GREEN ON BUFF ENVELOPES