Unique Art Antique carries both early 1900's and 1940's milk glass. Produced around the world for thousands of years - by the mid-1800s milk glass manufacturers in the United States were concentrated in Eastern Pennsylvania. Popularity piqued around 1895-1910 - collectors created a big milk glass revival in the 1940s and '50s - collecting primarliy Westmoreland Grape Pattern and Fenton.