So I'm seeing 1410g over 1470g? If I'm seeing it correctly that means those are matched hats not New Beats.
The New Beat ratio in 15" cymbals is top about 67% of the bottom. The average weights for 15" New Beat tops and bottoms is 1027g over 1527g. That's based on a sample of n=23 in my database. Roughly the same ratio as in the 14" hats (where I have a much bigger sample) which is currently holding at 71%. But the New Beat ratio varies a bit with production era:
Based on those weights (and consulting the standard weight category names) I'd say you have a "medium heavy weight" pair of 70s matched hats. Might be just what drumphils was looking for after all...
Oh, and the hollow ink Zildjian logo on the bottom is dated to 1978-1980 according to Paul Francis (Director of R & D at Zildjian). He mentioned it in the video release of the new Avedis line. That's consistent with the 1970s stamp on them. As is the look of the hammering and lathing.