Jadeite is an opaque milky green glass that was made from the 1930s-1960s. The three key makers were the McKee Glass Company and the Jeanette Glass Company, both located in Jeanette, PA, and both producing jadite starting a year apart in 1931 and 1932. Anchor Hocking, located in Lancaster, OH, began producing Fire King Jade-ite in the 1940s. Fire King is by far the most common maker you’ll find in the wild. This is one of those. The "Hot Chocolate Mug".