An all-caps slab serif with squarish rounds. Origin unclear. Shown by Lettergraphics as Steamboat in a single style in 1976 [Lettergraphics 1976], but not yet in 1974. Shown by Phil's Photo with a second shaded style, see Steamboat Shaded [Phil’s Photo 1985]. Solotype showed both Steamboat Shaded [Solo 1992] and the shadow-only Invisible [Special-Effects and Topical Alphabets, 1978].