Value of a poster signed by the Edmonton Oilers the night they won the Stanley cup in 1984?

Sports memorabilia is so unpredictable. That's a legendary team with legendary names though and beloved by a town that lived and dies and made a cult out of those years of Oilers. You should get it authenticated but if you want to sell it then I would actually try to sell it to a restaurant/bar in the Edmonton area.... they might pay more for it than a individual.