Moderist Glass center piece

Offered here is a wonderful French Art Deco center-piece, sometimes called a coupe or tazza. What a design! Hard to believe there is no stamp, no signature or mark that I could find. The piece is in immaculate original condition, with perfect frosted removable glass bowl You can tell from the design, that someone had it in mind to integrate all of these wonderful elements, stepped bottom, stepped center support, geometric supports for the glass, zig zag, sunrise. I mean this has a lot going on, but still remains quite sophisticated and elegant. It is silver-plated in superb original condition.