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Hi, Rob:
Villedieu les Poêles is a *place*, a small city in Normandy, one where there have been many coppersmiths for a very long time. Mauviel is still there, as are some small artisans. So a mark of Villedieu simply conveys it was made there, and "Serie Speciale Villedieu" is not unlike a badge on a car that reads "Special Detroit Series". My surmise is that you have found what professes to be a commemorative series, maker unknown.
Aloha,
Kaleo -