Fyi the slide that is missing on the Goodrich that Mickey2 posted is often where the serial # was posted. Easy palce to stamp it, but they do get lost. Also on the smae machine the leaft tension bar accross the top should be twisted till is rests on all three pegs, and the bobbin winder needs to be swiveled so that the dive wheel on it would like up with the belt that doesn't exist.
You are blessed to have found such a rust free example. Enjoy it.