1382 Watch Mainspring 3.20 x 0.185 x 641 (25 1/4")(Calibers in description)

Dimensions: 3.20 x 0.185 x 641 (25 1/4")

End Type: Motor Barrel

Material: Swiss Made Unbreakable

Calibers: 

Hamilton mainspring # 232, Hamilton mainpring # 718014, Hamilton 936 (serial # 987001 & up), Hamilton 937 (serial # 652901 & up), Hamilton 940 (serial # 594501 & up), Hamilton 941 (serial # 623001 & up), Hamilton 942, Hamilton 943, Hamilton 944 new style (serial # 479001 & up), Hamilton 946 new style (serial # 479001 & up),