For slide rules, Picket was the cheapie brand, and Keuffel & Esser the premiere brand at least in my circles. I have my old K&E slide rule (somewhere!), and also my father's, which was made in the 40's. I transitioned to electronic calculators between high school and college.
Slide rule precision was physical--were those wall-mounted slide rules marked to provide greater precision, or were they simple used for classroom instruction? I suspect the Picketts are the latter. Those are abundantly cool.
Rick "absorbed into the TI borg until finally switching to an RPN HP in grad school" Denney