Isn’t this neat? I picked eight of these up at the local Salvation Army shop. I had never seen this shape/blank, but the thickness of the glass, the leg, and the very narrow optic convinced me that the glasses are old. There were sherberts too, but I ran out of cash (that’s all they take).
A contributor on the Elegant and Everyday Glass Forum identified these stems. I’d not heard of Utility Glass Works. I gather this was a company located in Maryland. It began as the Dugan Glass Company in 1914, transitioned to the Lonaconing Glass Company from 1915-1918 and then became the Utility Glass Works in 1920.