This a first-bloom seedling of Paph. Magic Flame x Tuxedo Junction, an un-named hybrid I got from Bob Wellenstein a couple of years ago. The flowers are 11 cm (4.25 inches) across, produced on a plant with nice varigated foliage.
Agreed, I think the dorsal is the best part of this particular flower. This plant has a little brother just opening up that is solid black-vinicolor and looks like it will have good form too.