Georgetown, D.C, Cover:
Mailed during 1873 (date provided by docketing at left), this cover was franked with a 3-cent Washington large Bank Note issue. The stamp has been cancelled by a duplex, the killer of which is a square or a blob. I also noticed that there were three, cleanly-cut holes in a triangular formation, on the samp's surface. Although impressed fairly deeply into the stamp, the "holes" don't break through to the inside of the envelope,
Patent cancel?

Image of stamp (color manipulated)-
