TB need ID help

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Hello - I understand that it's not recommeded to identify irises this way, but I'll give it a shot - does anyone recognize this TB?  The leading possibility is Balch Springs (Nichol's, '93), but I cannot find a picture to confirm, and the description I have reads "S. pale blue, F. dark blue".  No mention of the faint markings visible on the whole flower (hope they show up in the pic).  Any help is much appreciated.

 

Thanks,

Laurie

So.Maine, z4 - TBs finally blooming!  :)