Cristalleries de Nancy operated in Nancy France from 1921- 34 and produced many perfume bottles for commercial perfumers. This is one of their pieces and was used by a few companies for both colognes & lotions. It is an opaque green glass made with a green layer over white opaque glass. There are yellow & blue areas to the coloration which is probably why these are called slag glass by some. The stopper is clear green crystal in a flame shape.
6 " tall by 1 1/2" wide. The bottom of the stopper has chips which could be removed if desired.
French Cristalleries de Nancy Opaque Green Perfume Bottle