Wow Chris77 that is beautiful. It was made in Japan. I have a White with similar colors. Some times clones were sent with no motor and the OSMG put a motor and foot control on it or it is possible someone replaced the motor at some point. We have a lot of info on cleaning and if you read this whole thread I have posted info on finding a generic manual. Here is a thread on cleaning you might enjoy.
http://www.quiltingboard.com/vintage...y-t194930.html
There is info in the sticky notes at the beginning of the vintage section on cleaning up old sewing machines. Muv made some real nice videos. You do need to be careful of the finish. Your's does not look all that dirty from here - I can't even smell it. The lever is for zz and the knobs set it to stay in one place. The cool thing about the lever is you can move the lever as you sew and cause some patterns which are a bit free but kind of fun to do.