I need to grumble about something.
If you list a machine on CL in the middle of garage sale type listing (Everything must go! Priced to move! recliner, couch, kitchen supplies, vintage sewing machine) and someone contacts you about it. Don't assume they are going to offer you top dollar if you don't know what you have. "NO! It's worth more than that!"
Then research the machine, make a listing for just it, set a price, take a picture.
/grumble
(I know, I know.. it's craigslist. Still, I needed to grumble.)