These scans are of a "Press Reviews" leaflet
that Armstrong produced as a publicity
handout. It reprints reviews from:
  
Page1:   "Luister" (Dutch) Nov 1973 Review of 621 by Jan Kool
Page2:   "Audi"o May 1973 Review of 626 by Fred Judd
Page4:   "HiFi Answers  December 1974"  "Top Systems Spotlight"

N.B. Some parts split over different pages to fit the printed
page sizes.