Wall dial telephone, based on BPO 700 type circuitry (hard wired with regulator).
Made in the early 1960's.
The cover is made of plastic and the handset is the BPO No. 3.
The telephone is badged ATE and it has an ATE dial but inside the telephone is the Ericsson part number N1220A1
The circuit diagram paster shows an ATE diagram number of L532775 and also an Ericsson diagram number of N193331.
Probably this telephone was produced for ATE by British Ericsson.
Last revised: November 15, 2020