The pale chartreuse green hue and geometric form suggest an Art Deco or early Mid-Century Modern influence, dating it to roughly the 1920s-1940s. There are no visible maker's marks in the image, which is common for mass-produced pressed glass shades of this era, but subtle wear and the hand-molded appearance indicate authenticity.
This shade is moderately rare, particularly in its specific combination of color, tiered geometry, and textured finish. While green molded glass shades were produced in volume during the Art Deco period (often by American or European glassworks like Indiana Glass or Fenton), the stepped, multi-tiered shape is less common than simpler bell, dome, or empire forms. Similar "skyscraper" or stepped designs evoke the era's fascination with modernism and architecture, but the green tint (evoking jade or emerald opaline) adds scarcity, as most surviving pieces are clear, amber, or milk glass. I expect with the right bulb this has a "glow" to it. Base measures 4 in diameter.