So what is it ? Use the parameters that you have seen at least one for sale or you found at some charity shop by chance. Is it the Wilson Pro Staff 6.0 85 St Vincent or the Adidas GTX Pro T or that Volkl Zebra which tends to be ultra rare. It's got to be a classic ... Suppose this goes without saying in a classic racquet forum. Value also comes into the equation . Just go for it .. Your personal holy grail .