Is this a Fenton Vase or just a replica?

Is anyone able to help me identify this vase? It has a lot of characteristics of Fenton but I've been unable to find a mark on it anywhere. I notice there is a few small air bubbles throughout, nothing majorly notable. There is also a black fleck inside the glass which doesn't seem would pass Fenton inspection, but again, I'm unsure. Any advice on how to get a better idea of the manufacturer? Thank you in advance!