I found this Flickr set of the super rare Die Neue Haas Grotesk type specimen book. For those of you that don’t know, Die Neue Haas Grotesk was the original name for Helvetica. You can get a glimpse of the book in the film Helvetica when Matthew Carter shows off his copy. It was also on display at the MOMA as part of an Helvetica exhibit.
What I would do to get my hands on a copy.