I not so recently purchased a couple of machine - one of them in a green case. Looked at it more closely today. It is a BelAir 600 made in occupied Japan. Serial # is B517288. It is shiny balck and looks to be in good condition minus one thing. The bobbin plate, covers where the bobbin sits, is missing. Does anyone have any idea if there are interchangeable parts available or is that a Needlebar question. I know I will need to look there for a manual.