http://www.ebay.com/itm/Antique-Sing...-/331607899970
At currently $42 with 3 days left this is the same machine as the modern sphinx for $2000. I noticed the Goodwill machine had no serial number and looked into this some more and found that another eBay seller was offering this machine as a 1973 authentic Singer reproduction.
While you can forgive the folks at Goodwill for not knowing what they are selling, the guy/woman who posted hers for $2000 should know better.
