GeorgieporgieI have read somewhere that Mauviel has stopped producing the cast iron handles, and are now selling stainless steel, electroplated to look like cast iron, under the same model designation of M250C ("C" for Cast iron).
I have to rely on Google Translate, but it appears that the French website describes the M250C as "electroplated cast iron" and not "electroplated stainless". I do not know whether electroplating cast iron might even make any sense, and however the American Mauviel website clearly states that M250C is cast stainless steel, electroplated to look like iron.
https://www.mauvielusa.com/m-heritage/M-250C-cast-stainless-steel-handle-with-iron-electroplated-finish-cat158.html?sortBy=favorite
I am perfectly happy with cast stainless steel, myself.