Lily Service: The onset of (alcohol) Prohibition in the United States brought about a rise in the popularity of less intoxicating treats. In 1922, the Public Service Cup Company of Brooklyn, manufacturers of Lily Paper and Lily Cups, mentioned in an advertisement for a Soda Fountain trade publication that sundae cups were now available. The ad showed their regular tall cup frame (with the paper insert) which matches the arches design on the sundae frames in the following photos:
18% Nickel Silver is a reference to the base metal. The frames appear to be silver plated, though this is never mentioned. Lily would eventually become Lily-Tulip. Adults may have gotten back their booze and handed the soda fountain craze over to the generations of teenages to come, but the paper trade was set to stay..though without the silver as stainless steel largely bumped it from the scene.