While we're on hand hammering, I just came across an article by Mike Awerin for Spin Magazine, May 1989 issue - an interview of Mehmet Tamdeger and Agop Tomurcuk way back when they were still together:
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"...Inside the shop, a worker with a long pole served round pieces of metal into a wood-fired furnace, like pizzas. When they had been red-hot for a time, he pulled them out. Asked about timing, Mehmet pointed to his eyes and replied: "Experience. We have no thermostat." In an adjoining room, the metal was hand hammered. The number of taps and the amount of pressure and spacing of the indentations determine the sound. Asked about quality control, Agop pointed to his ears and said: "We do not need graphic equalizers."
I wondered why they didn't franchise or license or build another oven. They explained that they were living well enough, export business was growing slowly but steadily, they did not want stockholders or foreign partners looking over their shoulders (Paiste made an offer, which they refused), and anyway they were selling quality, not quantity."
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I hope they're still doing the same things, though separately...
As for Mehmet, you may find this interesting, an article just from last year -
http://www.ethnotraveler.com/2015/01/the-loveliest-commotion/Based on what I've read, Sir, you may not be needing "more discerning" ears since they may have discerned the cymbal sound for you already hehe ... it may be safe to say that any Istanbul cymbal you choose will still sound better than a mass produced one...