Sorry sugarcube5419 I do not recognize the mark and can't really tell what it is. I can tell you I do think it is an older piece c1800s and looks to be of Czech , Bohemian, Moser STYLE glass vase. I would start your research in those styles of glass, The shape is very unique. Look for that shape with different design or same painted design on different shape. This could take you years to find a maker if ever. Good luck