It is a Singer 306 - if everything works it may well be worth the money and more.
They are an early zig zager with cams to do decorative stitches.
It looks nice and a nice cabinet.
I hope you don't have any trouble selling it.
here is info on a 319 - it is very very similar but doesn't have the keys at the top:
http://www.quiltingboard.com/picture...c-t162425.html