Does anyone know what Hamilton M/S will fit a 19 jewel Ball Ham watch...Watch has a jeweled barrel...I don't have any parts info on Ball watches..Thanks..

Gary,

That spring would be the same as a 944. The old style motor barrel is a Cat. No. 14, new style motor barrel No. 232. The new No. for the 14 is 718010 and the 232 is 718014.

This link may be helpful: mainspring for 18 size Ball Hamilton 19 jewel

RR

Thanks Richard..