Here is a link to one. With early models 66 there is one difference worth noticing: When you take off the bobbin cover (completely) to clean and oil (taking out the bobbin case), there is either a screw in center that needs to come off too losen a bracket, or there is a lift up lever that slides to the side (up and towards you). If you have the lift up lever type, be a bit careful not to mess with the screw in center there, it can end up with a hook, race and bobbin case sliding about and a lot of fuzz with bobbin tension. You don't need to have the exact year for the manual, just be aware 66 were made for decades, and went through slight alteration. It came as treadle, and handcrank and electrical motor, and all three usually came with the same manual.