Can't say exactly, but they have the coarse versus fine lathing so that suggests they aren't EAKs. Years vary a bit for EAKs depending on who answers, but let's say EAK = 1981 (some say 81, some 82, some say 1979) to maybe 1984 (but again there will be different dates floating around).
Here's an example of the fine EAK lathing if you scroll down from here. I also shows the K in on the underside:
http://black.net.nz/avedis/hammering.html#h-can-k-bot
You haven't posted a picture of what ink is on the bottom of yours. Have you got a K or the word Zildjian on the bottom?
So yours would be after 1984 or so. At the other end of the likely time period those come before the laser serials which began in 1994. That leaves a 10 year period.
If anybody else has some evidence about the year when the lathing moved from fine to coarse, and when the K on the bottom became Zildjian than that might help narrow the margin of error.