Internet Horology Club 185
18s Ball Hamilton mainspring

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https://ihc185.infopop.cc/eve/forums/a/tpc/f/1086047761/m/5853962967

January 06, 2012, 21:18
Joseph Pierzynski
18s Ball Hamilton mainspring
Hi, I'd like to have an extra mainspring on hand for a 18s Ball Hamilton. Would someone be able to tell me what Hamilton mainspring # would be correct for an 18s Ball Hamilton? Thanks in advance, happy 2012, regards Joe
January 06, 2012, 21:25
Jon Hart
Swartchild has #4371 (Co No 15) for 17j 18s Hamilton and #4370 (Co No 15) for 19-21j 18s