The Silver Jubilee was in 1977.
Many numismatic items, both coins and medals, were made to commemorate the event, throughout the British Commonwealth. Many of the medals were privately made and sold as souvenirs at local events held to mark the jubilee. This piece is clearly of Canadian origin, given the French language on one side and English on the other, but other than that I don't think much can be told.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis