I found one for sale and pic if anyone wants to see what it is: scroll to the bottom of the list.
http://www.singersewingmachine.com/newmachine.htm
I'm sure she tested and tweaked the one she would use. Some machines you can tell she isn't real enthused about if you watch her for a long time. I've been watching her since day one.
Oh the price of the machine now is almost double what I paid for it.