This ball has been hanging around for years.  You do not have to be an expert on Yaz signatures to see that this is a pathetic forgery.  Look at the formation of Carl. Never have I seen a Yaz autograph where the Y was formed as part of his first name. Compare this to ANY of the Yaz signatures on ebay right now and there are hundreds of them.  This one is not even close.   And the interesting thing is the price.  A buy it now for $138.00 which is a good price for an AUTHENTIC Yaz ball, but no one is buying it.