My new Daughter-in-law inherited her grandmother's featherweight. We don't know a lot about it. My son found the SN, AM778572. There were actually two manuals one was for a 221 and another was a 221-1. What is the difference? Which one is this machine?
Also, the wiring appears original (the old paper wrapped electrical stuff). My son is worried about it not being grounded and it appears to be starting to get really brittle. I personally would replace it but does that lower the value of this machine? Otherwise, he says it looks really well cared for.
I'd appreciate any insights.