Westmoreland glass. Green and white swirl bowl or vase. Or just decorative. Absolutely insane how pretty this bowl is. Tiny little footed base. No imperfections. Nothing. Westmoreland Glass 1950-1984 Volume II by Loraine Lovar this shape is shown as rl-8. It never specifically names Marble (slag as other companies call it); but lists milk glass as one of 5 colors in this shape.
A book on marble slag glassware says that marble (slag) was only produced between 1972-1979 by westmoreland.
It's 8.5"W at the widest points and it's 4" Tall.