John Seiler's presentation is pretty long and in a different format that's tough for me to access, but here are a few pictures from it that I extracted by doing "print screen" and cropping. Again to emphasize
these are from a document that John Seiler prepared and everything you see below is from his work. I am acting on the assumption that since John shared this with me some 8 years ago and mentioned no restrictions at the time he won't mind me sharing it with fellow lovers of the Hawkbill shape.
The first is of an assortment of early versions of the Hawkbill:
The second is of John's collection at that time (maybe 10-12 years ago?):
The third shows Donkeynuts belonging to collector named Mike McCain:
The fourth shows Donkeynuts belonging to collector Mike Davis:
The fifth has an assortment of Ser Jacopo pipes:
The sixth shows a Radice:
The seventh a couple of Castellos:
In addition there are photos of pipes by a few modern carvers including Steve Weiner, Michael Parks, and Thomas James who took a swing at the shape.