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Special mainspring for automatic movements used by ETA, Benrus, Bulova, Hamilton, Longines, Lucien Picard, Movado and Tissot. ETA Caliber's 2821, 2821-1, 2821-2, 2821R, 2822, 2824, 2824-1, 2824-2, 2824-A2, 2824R, 2825, 2825R, 2826, 2826R, 2827, 2827R, 2830, 2830R, 2831, 2831R, 2832, 2832R, 2834-1, 2834-2, 2834R, 2836, 2836-1, 2836-2, 2837, 2838, 2839. Beneru K61D21 Bulova 1373.30, 1373.11, 1373.30, 1373.50, 1412.11, 1413.10, 1413.30 Hamilton 625 Longines 633, 633.5, 636, 636.5, 639.2, 640.1, 641.1 Lucien Picard 91E Tissot 3103, 3104, 3108, 3152.
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