Unfortunately, this iris sold to me by Van Dyke's is not the real "After the Dawn" which has lavender standards and yellow falls. It's a nice iris but a disappointment since I was really looking forward to the real one.
After a lot of research, I think I have identified this iris as Dawn of Change (Ernst 1993, Hula Girl x Hula Girl). It is a good grower so my disappointment is not so great any more.