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The best resource for acquiring any information on Hermes saddles (at least here in the US) is from their 2 specialists. There is one based in the Madison Ave store as well as the Beverly Hills store. They have even put together a site that talks about the fit and offers information on all of the models!
http://hermesfitadvisory.shutterfly.com
All of their contact information is there as well
They offer a fantastic test ride program and are often able to "fit" or assess in-person.
FSH has been keeping records of the saddle registry numbers since 1900! This makes re-selling or buying a used saddle much more reliable since the specs can be looked up! (Sorry all - they do not offer any similar program for handbags)