Again although not classed as Retro I believe its worth mentioning the most popular British Bakelite telephones (classified as Antique or Vintage), known as the 300 series Bakelite telephones.
They were the first British Bakelite phones to contain an internal bell. Before this telephones always had a separate “Bell Set”. This superb telephone with its classic hard lines is very sought after today. The standard 300 series telephone was known as model 332, although the 300 series range contained several models, usually resulting in extra chrome buttons (above the dial). For example, the model 312 had an extra chrome button for shared service working (when telephone lines were shared with another telephone subscriber due to lack of available wires to the local telephone exchange).
The other models with the extra chrome buttons are rarer than the standard 332 and hence they are more collectable and harder to find in “Grade A” condition.
In this Bakelite Telephone Era 99.9% of all these telephones were Black.
The rarest colour for an antique 332 telephone is Green as in the one above.