Mainspring - 907-908

907 Mainspring loop end of Sizes: 8.00 x 0.35 x 1000mm, 8.00 x 0.42 x 1100mm, 7.50 x 0.38 x 1000mm, 7.00 x 0.32 x 900mm, 7.00 x 0.38 x 850mm
908 Mainspring loop end of Sizes: 7.50 x 0.22 x 550mm, 6.00 x 0.33 x 420mm, 5.00 x 0.30 x 450mm, 4.35 x 0.30 x 600mm, 3.25 x 0.27 x 600mm