There are several things you need to know about your Singer sewing machine before you can determine its value. First, identify the model number on the machine. Next, grade the machine’s condition. If it still works or is in generally good shape, the more value it can command. Finally, check to see if it still has all the accessories, parts, attachments and the user’s manual. Having the bells and whistles will significantly increase the value of your machine. Then take your machine to an antique appraiser who can estimate its worth.