I know exactly what that is, and are you ever lucky! It is a clone of a Singer Model 15, called a Japanese clone Model 15. I have one just like it, but badged under a different name. Different sellers had them badged, or labeled with the seller's name, but it is the same machine. Mine is labeled "White". These were made around World War II in Japan, and the distinctive color gives that away. I just finished a complete meching on mine and, as always, that baby purrs. I gave it new wiring and a longer cord as well. It goes through fabric like a knife through butter. I totally love mine and would never give it up.
BTW, did you know you can get attachments to have it zig zag, do blind hems, make buttonholes, and more? They are normally available on e-bay. Also, this is one of the best machines for machine quilting ever made. One reason is the vertical bobbin. I haven't tried free- motion quilting on it, though.
Cherish that machine! I know I cherish mine.
Cricket