Marvin is shown in their 1968 catalog (kudos to Ray Cruz for sharing!) and came hence a tad earlier than the other Marvin which was designed by Mick Chave for Face Photosetting London in 1969. Schaedler’s Marvin doesn’t have a lowercase, but it includes one to two swash alternates for most of its menhir-shaped letters. The catalog shows an outlined variant dubbed Marvin’s Ghost. As with most faces from the phototype era, there are numerous copies and clones of Marvin. Its aliases include “Berger” and “Basso”. I’m not aware of a proper digitization.