ETA 2824-2/2836-2/771 SELLITA SW200-1, SW220-1, SW240-1, SW260-1, SELLITA SW500-1, 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.
ETA 2824 main spring