9-Scale All-Plastic Beginner's Slide Rule
Teledyne-Post model 44BB-150 [1972+]
Manufactured by Acu-Math Division of Sterling Plastics.  (Also sold as Acu-Math No. 400.)

This slide rule does not appear in the 1972 catalog; my guess is that it dates from 1975 or 1976 and it was Post's last slide rule.  I'm guessing that Hemmi had given up slide rule manufacturing but Post wanted to hang on with a cheap all-plastic rule.

  Teledyne-Post 44BB-150.  Back is completely blank.
No date code.