I don't know the answer to your question, but the old steel Sensitone Elite snares are my favorites. I sold off all my other snares except for my three Sensitones. While the new design certainly is great "eye candy", I'm not jumping to get one. In my opinion, the old Sensitones work perfectly and unless I get a serious case of "Snare Fever", I'm going to stick with my current ones.
I think the steel models have a seem and always have. That doesn't make it a bad drum, at the quality level the Sensitone is at, the seem with not even be noticeable to the eye. Entry level models have a pretty obvious seem. Doesn't really matter, seem or not, those are great drums.