Hello and Happy New Year!
What were the dates that Zildjian started stamping the model designation (i.e. "Deep Ride) on the top of the cymbal (with no size designation) and the "Hollow Logo" on the bottom of the cymbal, and when did they re-format the printing to include the model and size designation, small script logo on cymbal top, and large script logo on the cymbal underside?
I am guessing the hollow logos go from around 1976 to about 1983 or so.
I know someone with more knowledge then I will have the answer.
Thanks and again, Happy New Year!