This model, the GPO Telephone No.162, was the first all-plastic telephone to be made (Phenol Formaldahyde, tradename 'Bakelite').It was available in a mottled walnut brown (extremely rare), then black finish, as shown here.Chinese red, Jade green and ivory colours were also available but these are not strictly 'Bakelite', being made of the slightly more modern Urea Formaldahyde.