I have two POG's (mid plus) which have the 4 green stripes which were made in 1987. Do the new Prince Graphite Classic Mids on the TW website, with the new paint jobs, play the same? I'm thinking of getting two of the "newer" models but wasn't sure if there was a significant difference in playability. Also, of my POG's one has a <Y> Patent while the other has a <P> Patent. What do these letters signify?