1940s Bakelite Five Push Button Intercom Telephone

This is a five button Intercom or Telephone constructed from bakelite and steel receiver hook. The handset is marked 184 52. I have been informed this was made by Phoenix Telephone & Electric Works Ltd and updated for ARP telephone systems - per a reference book 'House Telephones, Bells & Signalling Systems'. Overall in good condition slight damage to mouthpiece grill. Retains its old cord wiring. Part of an old display the (copy label) reads; Dispersal, Stanmore, HQ 10 Grp, HQ 12 Gap & Op 1.