yes, Alsace is one of the leather centres in France, but Haas to my knowledge is one of the very rare tanneries who can make Novonappa leather Which Hermes calls Barenia. Haas does belong to the Chanel group (btw, its interesting that Chanel doesnt use novonappa in their bags).
Anyway if Hermes can source their barenia from Haas, its not embarrassing for JD to do the same & give it a name of their own. After all, JD tanneries used to exist way back in the 18th century, they don’t manufacture leather any more. As far as I know only 2 luxe companies use novonappa today : Hermes & JDuclos. Back when Ramesh was designing Moynat he used it there but since he left I havent seen any novonappa at Moynat.
Its v interesting that JD store manager told you they dont use Haas, I‘m planning a Paris trip soon with my eye on a St Clair so will definitely ask some qs esp because i love novonappa so much.