Printed on paper with papermaker's watermark 'SPECIAL POSTAGE PAPER / LONDON', parts of which can be found on individual stamps.
Cockrill #PC41, Rogers #R13
Stamp of 1911 overprinted "BUREAU OF INTERNAL REVENUE" with a diagonal rubber handstamp in violet, violet-black or black
The handstamp is 61mm long, such that only parts of it are visible on individual stamps. It may exist reading upwards or downwards, upright or inverted.
Cockrill #PC49
