The FW's from the 50s didn't come with the fancy scroll face plate.
If you find a 50s model with the scroll plate, it is not original to the machine.
I got my FW on ebay in 2005. It was in excellent condition, with several accessories.
Including: buttonholer, feet, original small oil can, original accessory box.
Although the handle on the case was in less that ideal condition. (no biggie to me)
I paid $167.00 with shipping.
I think you should be able to get a very nice machine around the $200 range.