There is a great book you can still get called " Featherweight 221 The Perfect Portable". It has all the history
about every model of Featherweight that was made. Everyone should have this book.
The value of most Featherweights usually depends on how good the decals and clearcoat still are.
If the finish is good the older machines are worth more.
As far as sewing the newest machines are best. They have a better clearcoat finish, a graduated needle plate,
and a stronger type motor.
The white machine with the belt drive is a cheaper made machine but they still fetch a lot because people
like to collect them.