Hi, I recently acquired these hi hats. I've posted on the pearl drummers forum, and they said to head over here for a better chance of an answer. So, could I have some help identifying the age of these cymbals? All of the pictures and details are here: http://www.pearldrummersforum.com/showthread.php?263225-Vintage-Zidjian-15-quot-Hats-when-were-they-made&highlight=
Thanks in advance.