One of the variations of Chwast Art Tone (1964). Shown in PLINC’s Alphabet Thesaurus Vol. 3 (1971) alongside Art Tone Whitewash B (outlined) and Art Tone Black Bottom (w/ closed apertures at the bottom). A copy of Boot Black appears in Solotype’s catalog, Phil’s Homage To The Alphabet and Berthold’s E1 as Tulo, which has been digitized as DXS Tulo (Dick Pape, 2010). Formatt’s copy is named Concert. Bottleneck (Letraset, 1972) is similar.