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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 | |||
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Swartchild has #4371 (Co No 15) for 17j 18s Hamilton and #4370 (Co No 15) for 19-21j 18s | ||||
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