This is a beautiful antique Art Nouveau clothes or lint brush in repousse sterling silver. It was most likely originally part of a larger vanity set. The sterling silver back has a gorgeous floral design typical of the Art Nouveau era. It is marked Sterling and there is a maker's mark that is illegible. I have seen these items framed as art and this one would certainly be worthy of that treatment.
It measures about 5 1/2 inches by about 1 1/2 inches. It is in very good condition. There are some small dimples in the silver along one side.