Question about #9b13 chord - tritone sub or something else?

[1945 Buescher Aristocrat]

Is there a standard way of looking at a #9b13 chord, I mean as an extension, or stacking of a certain type of triad on top of another triad?  If so, I don't see it - maybe there is something in an inversion or common voicing that I am not seeing.  The application that prompts this - full disclosure - is the last chord in each chorus of - not a gospel song - Recordame.  I recognize it as both a tri-tone sub of a possible Bb7, but also as part of a minor turnaround to the A-7 that starts each next chorus.  Any thoughts? 

[bug]

It's an Augmented 7th with a sharped or raised 9th. In concert it would have E as it's root for the tune Recordame by Joe Henderson. It could be identified on the piano as a 7th chord in the left hand with no 3 and no 5 and an Augmented triad on flat 6 or sharped 5. In other words E7 with no 5 under C+. E7 no 5\C+

During that period Wayne Shorter and others were experimenting with brightening up the Major triad. One way they were doing it was by making harmony with two Major 3rds stacked on top of each other, rather than the more common Major 3rd and minor third stack of the Major triad.