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I input this image (a crude tracing from a poor scan of the Typography 21 book cover) into the type identifier on MyFonts.com and it told me "Bell Centennial", however, it's not quite the same. The "divit" thingies (for lack of a better term) really make it unique. Bell Centennial has these on the numbers, but most of its letters are just plain block like a Helvetica. The "divits" are very noticeable on the "E" and every other letter, yet Bell Centennial does not contain these on the standard weight of the font...the heavy black version of the font does though...but I'm looking for a normal and bold weight, not black. Can anyone help?