Mainsprings

4 x 14 x 8.5 1.30 x 0.07 x 220 GR3186 Bestfit MS-414C

4 x 12 x 8.5 1.30 x 0.09 x 220 GR3217 Bestfit MS-412C

3 x 13 x 7.5 1.20 x 0.08 x 200 GR2868 Bestfit MS-313A

2 x 13 x 6.5 1.10 x 0.08 x 180 GR2576 Bestfit MS-213W

3 x 14 x 19.5 2.30 x 0.205 x 500 GR6446 Bestfit MS-143X

8 x 9.5 x 13.5 170 x 0.12 x 340 GR4936 Bestfit MS-89P

6 x 6 x 16 1.50 x 0.18 x 420 GR4312 Bestfit MS-65V

2 x 8 x 13.5 1.10 x 0.135 x 340 GR2680 Bestfit MS-28P

2.00 x .075 x 400 Manual Swiss Mainspring / 11″ x 14″ x 15″ GR5714

Fits Seiko Movement #s: 3180 Measurements: 1.45 x 0.13 x 420 / 4.5 x 11 x 18.5