Singer Sewing Machine, plus attachments and case

This is my grandmother's sewing machine that has been sitting in the closet for literally 50 years unused.  It's in good condition, but since I do not sew, I would like to give it a good home.  I am told by people who say they know what they're talking about that it's a  Featherweight 221.  The AF serial number dates it to about 1939.  Not shown in the picture are several attachments (feet, I think they're called), some bobbins and a case that's in good shape except for a worn handle.

So what is it worth?

Good