I'm down to four of them. I keep thinking I should find them homes so my kids don't end up dumping them after I'm gone. I've warned them about their value. However I've got an singer attachment collection that is worth quilt a bit more than all the FW's combined, and those really don't look like they'd have any value at all. Though the machines got the nickname Featherweight a long time after they went out of original production.
They came in black (both closed and open arm) and tan. Later the celery (white) version came out and that has a hardwired cord and pedal. And much, much later, Singer made a model actually called "Featherweight" but it's a small plastic machine and not like the 221 model.
I've also got a folding table, and the earliest model of the cabinet - the one that has the lift up tray. Later ones were fixed and you manually lifted the machine from the storage shelf to drop into the opening in the top after removing the cover.