I have an old Singer machine that looks a little rough. It has a bent wood case. It sews like a dream I mean the stitches as very even and nice. I need to get a new o-ring for the bobbin winder. My husband clean up the motor and it runs nicely. I don't know the model number or how to find out what it is. I was wondering if any of you could give me advice on what it is worth. If you were in the market for one what would you be willing to pay. I would apprieciate any help or advice you could give.