Philippine Constabulary 4c 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

CURRENTLY THE EARLIEST DOCUMENTED USAGE
Previous Earliest Recorded Usage: September 20, 1910

1910 NOVEMBER 29: MANILA to BERLIN

LESS THAN 10 USED ENVELOPES EXIST
Dr. Tommy Sim Collection