Vintage sewing machines don't bring much in the marketplace. I'm sure it's a great machines. Most of those post WW11 Japanese machines have excellent workmanship. However, most new machines have lots of bells and whistles that older machines don't have. You can buy a new sewing machine at Walmart for $100.00.
My best guess is that you will end up getting $25.00 to $50.00 for it. Of course, it all depends on your local market. Look on Craigslist.org and similar sites and see what people are asking. That doesn't mean that that's what they are getting. I'm in DFW, and I'd ask $100.00 and be happy with $50.00.
bkay