I have an autographed celebration day poster and believe it to be authentic. I would like to post a picture and have some on here let me know what they think. Not sure if anyone is still reading this thread though.
Unfortunately Robbie, i am confident that this is a fake. I dont know early zepp sigs well, but this strikes me as maybe a fan doodling there version of the bands autogrpahs. Compare all the J's in each signature. Note the hook to he start of the J, they are all teh same. Also check out all the O's, they are all identical too. I dont know if someone made this in an attempt to rip someone off or not,, but in any event, i am fairly confident the item is a fake. But wait for others to comment.