I believe this letterhead from Book of letterheads set in type without aid of hand-lettering or special artwork, etc. was created as an example of what the printer, Robert A. Williams, could do. There are nearly 200 other letterhead designs in the book.
The original metal version of Bernhard Gothic contained various alternate glyphs such as this single-story ‘a’, ‘r’ with curled ear, and narrow zig-zag ‘s’. The only digital version I know with these alts (as well as the standard glyphs) is from Spiece Graphics. The lengthened extenders on ‘l’ and ‘p’ may be customized, but many geometric typefaces of this era (e.g. Atlas, Nobel, Ramsès/Apollo, Stymie) offered such alternates.