unknown fabulous glue chip vase Art Nouveau art deco French? Pierre D'Avesn

Here is a vase that is sure to confound the most knowledgeable art glass collector. I have been collecting for 15 years and it really frustrates me after 5 years of research, I still have not identified this one. the vase stands 12-1/2" tall with a 3-3/4" base and a 6" by 6" upper rim area at the shoulders. There is extensive wear to the base. there are no identifiable markings to the base by any means. the glass is heavy and thick and the foot of the vase is highly unusual. It is a opeac clear glass on the base area graduating into a green color towards the top. All corners are rounded off. It is essentially Square in shape from a birds eye view with the softened corners. the vase has a indent or pinch on all four sides. the upper vase opening is located at the top after the vase sides curve in level from the shoulder edges and is circular. the inside rim diameter is 4-1/8". The pattern or texture is a very consistent glue chip technique. Any help would be appreciated. The only two possibilities I can come up with are Pierre D'Avesn. I may be listing this in my E-bay store soon! Le5t me know if you would like to see it there? My E-bay store is called Glassey Place and e-bay name is 2*pleese*u I live in Minnesota. Michael.