i would say no more than $400-$420. WGA authenticated ones are worth much more, he owns the company, they are worth probably around $550-$570, they're by FAR the most reputable when it comes to his stuff. When he dies, of course it would go up in value, as will the WGA ones, but that won't be for a while yet. He's a pretty healthy guy.
Chat with our AI personalities
Assuming you have LEGITIMATE authenticity documents with it and it is a Gretzky game used stick from an NHL game it should sell for somewhere between $1200 and $2500. There are many variables that will affect the value such as: year the stick was used, brand of stick, amount of game usage and the overall condition of the stick.
I have seen a Gretzky game used stick used during an NHL finals series sell for as much as $10000. I have also seen a Gretzky game used stick sell for as little as $500. Like I said there are many variable that will affect the value.
Either way it is a very sought after nice collectable you have on your hands.