This one is less a typestyle catalog and more about technical specifications of the typeslugs, keytops and other products offered to typewriter manufacturers by Union. Want to know how to read the markings on type slugs? There’s some of that here. Want to know what size key rings are on an Orga Privat, a Kappel Portable or a Torpedo Solitaire? This book’s got you covered. Familiarizing yourself with this material will do much to further your understanding of typewriter faces, as it spells out a lot of the detail that other catalogs omit.