Hettier & Vincent made the highest quality pate de verre lampshades of the French Art Deco era, usually for other artists, and as such it is very rare to find pieces with their own signature as we have here on all four outer shades.
The fitting of this chandelier itself is unique to my knowledge, the bronze detailing to the cage framing the central flame being an especially nice detail.
The original wiring is still in place and needs renewing, and adds a nice touch I feel.
A striking piece which is clearly of the era, the highest quality, and most  certainly unique.  
Available exclusivly at ChateauAntiques.com