Thanks so much, Mark!
Wow, that booklet is a real piece of Hoover history. You don't often see a "Special" instruction booklet; they're kind of rare.
The models pictured in the booklet are not 825, however. It looks like a rebuilt 541 and 725 and some other hybrids. Often, Hoover would change the appearance and/or color scheme when they rebuilt the vacuum into a Special. That strange double band around that one vacuum motor in the booklet never existed as a first-run model in Hoover's line-up. I'm guessing they did this to make the rebuilts look completely different from the originals. Fascinating...thanks so much again for scanning and posting this. That took a few megabytes, eh? JL