Нет,возможно одинаковый, 4 и 6 материал Спрон.
As for the Spron 510, it is not used in the 7s movement series that are inside most Seiko 5s. The 4r, 6r and higher series movements have the Spron 510. If you want to double check just test the power reserve, watches with the Spron 510 will get greater than 50 hrs. The 7s movement usually has a power reserve closer to 42 or 45 hrs.
http://forum.watch.ru/showthread.php...450#post818450
Хотя я имел в виду не материал заводной пружины, а спираль баланса.
