People sometimes mistakenly posted that the Lange 1 "Cellini" had an enamel dial because it's hard to tell from the photos. That's how the confusion started. The dial definitely isn't enamel. The same confusion happened with the white-dial "Italian" Grand Lange 1 MP below, and folks would also sometimes ask if the 1815 Up/Down "Walter Lange" edition had an enamel dial.
I believe there are only 4 Lange models with enamel dials: The Anniversary Langematik, the Lange 1 Tourbillon Handwerkskunst, the Richard Lange PLM, and the Grand Complication.