Oh, 'tis the Mary Ann vase. It was made by Dugan and is known in Classic Carnival in both amethyst and marigold.
I reported in our Network journal back in 2000 that black amethyst reproductions had been seen in this pattern - then a few months later the first marigold versions started to emerge too. We bought ourselves a "fake" and set about figuring out how to differentiate between the repros and the originals.
I'll cut a long story short and tell you that I figured out the easiest way to check (that still seems to work) is to look at the base. If it has iridescence over it, then it's a repro. If there is none - then it's an old one.
The marigold repro also tends to be more of a yellowish amber mix than an old true marigold. Looking at your photo, I would say yours is an old, Classic one.
Glen