Vintage / antique milk glass/clam broth lampshade pendant light shade opalescent

Elegant white ribbed glass lantern shade that softens and diffuses light. Neutral white finish complements a variety of decor styles. Durable glass construction designed for reliable illumination. Simple, versatile design for easy integration into existing fixtures. Item does have markings on it with a small crack down side with markings on top where attaches to fixture.  This lampshade hung in my kitchen until posted.   Still in good shape.  You can feel the small crack if you run your finger over it but is not seperated.  Updates kitchen is only reason getting rid of it.  Measurements in photos.