Vintage GM Delco Electric Sewing Machine--MINT

This is one beautiful working machine and I am the second owner. The case is 18 inches long, 14 inches high, and 9 inches wide at the base. It comes with a 15 page instruction booklet. I can't find any information on this machine. The last two numbers of the serial numbers are not clear. T are three sets of numbers to choose from--20700,20706, and 20766. T is a fast and slower setting on the foot pedal. The light works and the motor sounds just light a fine machine should sound. What you see is what comes with this machine. I am going to charge the actual shipping cost but will list this with a $40.00 charge. I will refund the difference. It doesn't get any better than that. Please email me with any ???'s.