http://www.psadna.com/quickopinion/AuctionDefault.aspx
Here is the link. I think if you post a picture of the item on Net54 and give psa the link they will go ahead and give you a quick opinion. I know it says other auction house but i think they will do it. The good thing is if the won't Psa will refund your money back, so, you can't lose. Also, I don't trust GAI to authenticate anything anymore. They are endorsing Mantle fakes. Stay far away from GAI.