This sounds like lead crystal on the base and the top section, has a Victorian staple repair in the stem in three places and is in a poor condition with breaks and chips to the swans and flowers, glows green clear glass wise under UV light.
I collect broken repaired glass i love it. I have been through two murano books and there is nothing similar, i'm wondering who made this and a rough age. There is a rough pontil in the base and upper bowl.
It's 81/4 inches across the rim, 6 inches in height and 4 1/4 inches across the base.