This cover is one that I would like to learn more about. I am interested in the "Black MP CO, SC cancel". This is one I have not seen before and it seems worth additional research. I am interested in where it was generated. I have done some rudimentary on-line searches but so far have come up empty. The MP might lead to a Military Police (or Post maybe) not sure. The reverse is clean and provides no additional information.
If anyone has information or can lead me to a book or other research material that would be appreciated. It may be very simple (and common) and I am just not looking in the right places.
Thanks in advance for your time.