It is worth what you feel it is worth. If it looks very cute and colorful it might have some antique value.(see pictures) Does it have cams and or is it set in a table? Does it look mint? without a picture I would think $5 for just the machine with nothing and $50 if it is in a cabinet, has extras and looks cute. I am assuming it is running good.
Not a Kenmore but my husband bought this off Craig's list for $10. It was not running, cabinet was falling apart, had damage to the cabinet top finnish, had all the cams, does zig zag, drops feed, and had some rust. He knew I would love it for the color. When my new daughter in law saw it she squealed because she thought it was so cute. so when DH fixed it up and got it running she received it for her birthday.
And yes that is a brocolli rubber band we were using to see if it worked.
[ATTACH=CONFIG]202607[/ATTACH]