Auxillary Markings

Just going through some cover in a box, found this and I wondered just how many markings on a cover are there? I came up with,

Front:
Waco, TX Postmark
Killer Mark
Machine Cancellation
Missent to Montana St. Sta.
Forwarded, Fee not claimed
Fee Claimed By Office Of ...
Fee Claimed By ... Of First Address
Special delivery



Back:
Chicago, Ill, Recvd, Montana .. Mar 6,1928
Chicago, Ill, Mar 6, 1928 6 PM
Chicago, Ill Air Mail, Mar 6 7 PM
Chicago, Ill Air Mail, Mar 6 7 PM (2nd Strike)
Chicago, Ill, Main P.O. Mar 6 10:30pm with Killer 6
Chicago, Ill, Logan Sq. Station Mar 7 1928 (Purple)
Chicago, Ill, Recvd, Logan Sq. Station Mar 7 1928



And I may have missed one.

Art

I make it six auxilliary markings,
that has to be close to some record :)
I am not sure if "special delivery" qualifies
as it was applied by the sender and not the post office.

There are 2 special delivery, 1 by sender and 1 by PO.

I included the blue crayon on the back
maybe post office generated.

More on the CAM-21 First Flight Cover as shown above:

http://www.aerodacious.com/ccCAM021.HTM