Isle of Man 1 pound [solved]

3 posts
I have an Isle of Man 1 pound year of 1978 with mint mark E, just a single letter and metal looks exactly like a copper-nickel. I'm unable to make a scan now. Can somebody explain what do I have?
https://en.numista.com/catalogue/pieces40223.html
Token collector [1600-1899] with some coins
Thank you,ZacUK. It's clear now.

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