Part help

Thanks for posting. The top fitting of this balance certainly does resemble the 19-004, which is used on the Series 370, so that's possibly what you need; but without seeing a version of the damage with the foot actually intact I'm afraid there's no way to confirm this. The Series 371 and Series 372 use similar top fittings, for instance, but have different shoe attachments. See if the other balance from this window, or from an identical window in the house, has both fittings still intact. If you can produce this balance and send us photos, we should be able to verify what it is you need.