I have one dated 1983, which I purchased on-site when I visited there with my family in that year. It has the same coat-of-arms obverse, with the "Observation Deck" reverse.
It was the first Canadian "tourist dollar" I acquired; I've now got about a dozen of them, from places all over Canada. But only the one from Niagara Falls.
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