I recently got a pair of Zildjian 13” K/Z hi hats in a drum deal. Since I already had a set, I was familiar with them and the sound. This pair however is older. They have a much larger K on the top hat and does not have the R trademark stamp, and both cymbals have Zildjian and CO., with the O being as large as the C in the stamp. The lathing looks similar to the newer ones so I am unsure.
The set I already have has serial numbers whereas this set does not.
My phone camera takes pictures too big to post so I hope that I have provided enough to tell.
Thanks in advance.