I have one of those! It will be interesting to see what it sells for. I took a class at a quilt show once called "The Care and Feeding of Your Featherweight". You took your machine with you and learned how to maintain it and fix it. The traveling teacher said he had read about the white ones but had never seen one before. That they were quite rare and more expensive than the black ones.
I found mine at a yard sale and paid $30.00 for it. Just about fell over when my daughter spotted it because it was the second day of the sale and no one had purchased it the day before. Kind of like Christmas in July! Ann in TN