Perhaps a little late but this is what i think....After the war Pierre d'Avesn was active for Choissy-le-Roi, where he re-edited some of his older works and new creations under the label 'Sèvres', label inherited by C-l-R by absorption. In 1952 all the moulds and equipment at C-l-R were passed on to Vannes-le-Châtel, where d'Avesn continued until 1984. This model can be found marked P d'Avesn, Vannes, Art-Vannes, Cristal de Vannes and finally Vannes-le -Châtel.
In this case, as d'Avesn continued his career at Vannes, there's a strong possibility that it is an older d'Avesn model, re-edited by Vannes-le-Châtel.