If you post a picture, people can help you identify the model. Here's the Singer site that will date your machine:
http://www.singerco.com/support/machine-serial-numbers
This site is very fun- there's a step-by-step to identify your machine by its features.
http://www.sandman-collectibles.com/...r-machines.htm
There is also a site where you can download a free manual for your machine after you figure out what model you have. You don't have to pay for a manual. I don't seem to have that site bookmarked, but someone will have it if you post and ask.