1322A Watch Mainspring 2.85 x 0.22 x 559 (22")(Calibers in description)

Dimensions: 2.85 x 0.22 x 559 (22")

End Type: T-End

Material: Swiss Made Unbreakable

Calibers: 

Hamilton mainspring # 15, Hamilton mainspring # 718023, Hamilton 924, Hamilton 925, Hamilton 926, Hamilton 927, Hamilton 928, Hamilton 929, Hamilton 930, Hamilton 931, Hamilton 932, Hamilton 933, Hamilton 934, Hamilton 935, Hamilton 936 (serial # 0 to 987000), Hamilton 937 (serial 0 to 652900), Hamilton 938, Hamilton 939, Hamilton 940 (serial # 0 to 594500), Hamilton 941 (serial # 0 to 623000)