Hard to say how many of these exist, but they're a very difficult piece to find and easily overlooked because being newer production and ho-hum clear. Hemingray-16 / 2_38 embossing. No numbers and dots and no MADE IN U.S.A. which makes this an earlier made piece. I *believe* that items were required to have "MADE IN U.S.A." on them after 1939. If I am incorrect, please let me know. Blessings.