The Glasbake J-239 is a milk glass dish that was produced by Jeannette Glass between 1961 and 1983. The history of the dish can be traced back to the early 1900s, when the McGee Glass Company introduced Glasbake in 1917 as a competitor to Pyrex. The "J" in the product code indicates Jeannette Glass Co., and the age of the piece is after 1961.

There is a small factory flaw shown in the last photo. It is not a crack and does not have any effect on use. Please refer to the photos for condition. Thank you.