Zenstat, I can confirm the height of the stamp to be approximately 30 mm. The stamp is roughly midway between the edge of the cymbal and where where the bell meets the "bow"? The edge of the bell. The stamp itself seems a little askew. It doesn't run perpendicular to the cymbal edge. I don't know if that's common enough, but thought I'd mention it anyway. I bought the cymbal in a music store here in Ireland. They had a few second hand cymbals. That's all I know about it. I use it as a 20" crash from time to time because it's very crash-able and I prefer Istanbul ride cymbals. :D But this Avedis is a fabulous cymbal. That classic Zildjian sound.D' Drummer
As it happens I have a pair of 14" New Beats with that stamp and positioning and the defect of being a little askew. Plus another bottom hat where the rolling on of the die stamp was straight on as we expect.
According to Drumaholic the 30mm is the "early 60s trademark". But as I said before, he may know of that 30mm one making a comeback later on (in the later 1970s). I've been trying to get consensus dates for the appearance of the hollow ink Zildjian and later changes. The timetable at present goes
[LIST]
[*]1978 hollow ink Zildjian underneath
[*]1983 solid ink Zildjian top and bottom (no Avedis)
[*]1994 word Avedis added above and to left of Zildjian on top side of cymbal
[*]1994 laser serial numbers
[/LIST]
But this is certainly preliminary. In particular I don't know whether the word Avedis was added and then later the same year laser serials went on, or if you can expect all cymbals which say Avedis Zildjian on the top to have laser serials. Plus all years tend to come with a bit of uncertainty (plus or minus a year). Things aren't as exact and simple as they seem when you see them written down in black and white.
But any way you look at it, a hollow ink Zildjian logo on a cymbal with that stamp is an interesting and unexpected combination. Thanks for sharing.