When I speak about "enamel", not only the quality of the base material is important, but also the finish of the marking on it. The comparison made here between the Lange and the Breguet might be a bit misleading here, since the Lange dial is tampon printed, whereas the Breguet, at least according to my - admittingly leaky - memory, has hand-painted numerals, which is an entirely different class.
Regards,
Marcus