0828 Watch Mainspring 1.50 x 0.085 x 343 (13 1/2")(Calibers in description)

Dimensions:  1.50 x 0.085 x 343 (13 1/2")

End Type: Tongue End

Material: Swiss Made unbreakable

Calibers: 

Hamilton mainspring number 44431, Hamilton mainspring number 717270, Hamilton 730, Hamilton 735, Hamilton 747, Hamilton 748, Hamilton 752, Hamilton 753, Hamilton 754, Hamilton  770