R. J. K. & CO.
Robert J. Kimball & Company
Mr. Kimball's company placed this September 11 cancel on this stamp exactly 100 years before New York's financial district was attacked by Al Qaeda.
Robert J. Kimball, member, New York Stock Exchange
Kimball's office at 71 Broadway was only a couple of blocks away from the future site of the Twin Towers.
Kimball's office would have been covered in Twin Towers dust.