1985 saw the 100th birthday of Parks Canada, and the establishment of Banff National Park. By way of honouring the occasion, 1985 became a celebration of conservation and heritage places. Centennial celebrations and events occurred in every park, national and historic, across Canada. Four, 1 hour feature films were created in partnership with the National Film Board of Canada. Many commemorative products and collectables were produced to coincide with the event, including a $100 gold coin, silver dollar, and souvenir items which ranged from 18-carat-gold-plated lapel pins, to baseball hats, to golfing shirts — and the good old pinback badge.
The badge design features the Parks Canada centennial emblem, featuring the official Beaver symbol and the years of operation (1895—1985), contained in a round cornered rectangle. The branding was accompanied by the slogan for the celebration , set in Cooper Black — 100 Years of Celebration and Heritage (in English and French). It is assumed that these badges were worn by Parks staff, and also sold / distributed to the general pubic throughout 1985.
You can read more about Parks Canada and the Beaver symbol, designed by Roderick Huggins in 1973, here.