How do you identify Westmoreland milk glass?

To identify Westmoreland milk glass, search your piece for a maker's mark. Pieces produced from the early 20th century through the 1940s will usually display a W inside a keystone. Those made between 1946 and 1981 typically feature an interlocked W and G, which stands for Westmoreland Glass. Newer items generally have the full Westmoreland name on them. Keep in mind that some early examples of Westmoreland milk glass may be unmarked. Usually, if you hold these pieces up to natural light, you will notice bright colors along the edge of the glass. They will also often produce a bell-like ringing sound when struck. If your piece has these characteristics, a certified appraiser or experienced antique dealer can help confirm if it is a Westmoreland. On 1stDibs, explore a collection of milk glass.