From The David Charles collection

A Toronto-based technician in film, television and theatre, David Charles amassed an extensive collection of telephones and accessories over the course of his sixty-year career. Many of the items in the collection were featured in television shows and movies during that span.
As an avid collector, David not only collected but enjoyed tinkering with the items he collected.

This is one of the pieces from his collection.
A 1977 factory-reconditioned Northern Electric 6300A1 12-Button Call Director.