Many, many
reference books on PP as you probably know.
One of them probably describes the Reference 96 as Bauhaus inspired, and the rest is history. Or at least is the reason why the claim shows up in so many blogs.
This source quotes subject matter expert "Estelle Fallet, curator of the Musée d’Horlogerie et de l’Émaillerie in Geneva, (who) singles out the Calatrava for having “applied the principles of Bauhaus to watch design.” "
Still only an opinion, but it's an expert opinion.
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