I'll add a bit - might be Fenton's #572 Rib Optic (Fan vase). [Shetlar & Madeley "Stretch Glass"]
As for the shaping, I'll take a guess that the "as moulded" shape could well have been hand finished with cherry wood paddles. The vase would have been iridised before final shaping in order to achieve the "stretch" effect.
I think the colour is Tangerine - and the date, circa 1920s.