I can't help with your id I'm afraid, but I have a request please.
Is it possible to have a very clear picture or two of the base, showing the finish and the pontil mark if there is one. Your current picture doesn't show any delineation of the rim edge of the base nor a pontil mark, or wear (if any) to the base.
Also, is the whole piece polished on the exterior, including the background and the raised cameo work?
I'm sorry if you have a fake. And I recognise you may not want to add further pictures but would appreciate it if you could. I'm curious to see what the detail of the vase looks like please.
Many thanks
m