This Kellogg Masterphone 1000 Deskphone gets it's familiar name "Redbar" from the red bar that is used to operate the hookswitch. This model was manufactured in Chicago from 1947-1953 and it was a the first phone made by Kellogg that had interchangeable parts for the dial and non-dial models.
The case of this phone is the Bakelite and the handset is also made from Bakelite. The design was a significan't improvement over earlier Kellogg models in that the interior space was much more efficiently used, thereby eliminating the tangle of wires that was often present. This was accomplished through the use of a moulded one piece connecting block that was quite unique to the telephone industry at the time. The telephone components (capacitor and coil) plugged into the connecting block and were field changeable -- thereby allowing the phone to be easily converted between local battery, and common battery service.
