I have a question. Some time ago I read that on Singer machines the motor boss was put on some machines starting in 1901 and by 1903 all of them had them. I know of a machine from 1910, according to the serial number, that does not have a motor boss. The only thing I can think of is that it was a factory refurbished machine and a later serial number was stamped on it. Any thoughts?
Thank you.
~G~