No, I promise you this is not an Austin. Austin petals never have this arrangement. I have a couple of Perditas and three Sharifa Asmas in the garden and they don't look like this at all. Here's Perdita. See how perfectly defined the petals are, even when the bloom is fully open?
This rose is not a duplicate of any other rose in my garden, and the casual arrangement of the petals now makes me wonder whether it's a tea rose or a noisette with exceptionally large blooms.