I picked up an old Singer sewing machine. Patent dates start at December 5, 1882 and go to January 13, 1891. On a tiny plate at the base of the machine are the following numbers: 109910. I see no other numbers that might be a serial number. How do I find out its value?

See lots on Ebay for between $100 and $300. However they are still on Ebay so maybe people are not willing to pay that price. Antique Sewing Machines | eBay (http://www.ebay.com/sch/Sewing-Machines-/156327/i.html)