Looks post war Japanese - maybe some kind of badged machine. I think I've seen similar White machines. It isn't a 15 clone - the tension is on the side on the clones. Is the tension all there? It should clean up nice. Use a bit of Bar Keepers on the chrome and see if that make you smile. Muv has a good video on Utube for cleaning up an old machine.
This is a site for fixing up machines for missions would have fix up info and good generic manual type info.
http://www.tfsr.org/publications/tec...achine_manual/ Check with Sew-Classic for bobbins - she might have other parts that would work. Jenny has helped me a lot.