Basically what Macybaby said. The market is pretty much glutted with old sewing machines. Other than a handful of well known and popular models they just don't bring a lot of money.
Yours is small and cute. That helps but frankly they're a hard sell. I've been watching Craig's List in my market about a year now and there are a couple machines that aren't overpriced in any way that are still there a year later.
Good luck. It's a neat little machine and I would be interested but it's about as far away as it gets.
Rodney