Visible Silk Production Glass. Hamburg: Willmann, 1920s. Cut crystal glass is clearly empty, yet a bright handkerchief appears inside on command. With nickel-plated spring-loaded gimmick in base, removable for reloading; also includes a cut glass plug so the glass may be repurposed for other uses. Height 4". Spring on launcher a bit weak, else very good. A scarce example of this clever mechanical prop.