There are communal libraries in the laundry rooms of my apartment complex. (Some of Peter's gag gifts and books have ended up there--but they never last long!) A couple of weeks ago, I pulled a copy of Valley of the Dolls from the shelf and found something neat tucked inside: a mailer from Etobicoke Hydro.
From the font, I thought it might date back to the 1950s.
Some web searching revealed that the mayor listed on the card served from 1967 to 1972. It's not as old as I thought.
Business Reply Mail was 8 cents, and there's no postal code.
Etobicoke was one of six former boroughs of the Municipality of Metropolitan Toronto. Etobicoke Hydro later became part of Toronto Hydro, and Metropolitan Toronto was amalgamated into the City of Toronto in 1998.