I have a pair of 14" Zildjian Hi Hats. From the look of the printed logo on the bottom--hollow letters--the cymbals could be 70's--BUT--the strange thing about them is both in the lathing and the Stamp.
The cymbals themselves seem to be a bit heavier than any 70's era Zildjians that I have come across and the lathing looks much older and less refined than most 70's Zildjians--more like 50's.
Finally, the stamp logo says Zildjian CO, but the "O" in CO is not underlined like most or all of the stamps that I have seen. All of the letters are the same size and all in caps.
Anyone have any info?