This item dating from 1929 is referred to by Felix Marcilhac, René Lalique, Maître-Verrier, 1994, CP551, but not illustrated.
Cire perdue is an anicent form for casting a unique piece, in which a wax model is covered in plaster. It is then heated and the liquid wax removed and replaced with molten glass. Once cooled the plaster mould is destroyed. Cire perdue items have an absence of mould lines and are not polished.