Sassan, you probably won't find a date for your machine. Post WW ii may be as close as you get. The Japanese used whatever name sounded important to USA consumers. And they did not keep production records like Singer and others did.
Value is very hard to discuss. It all depends on one buy and one seller at a given time and place. Your machine is beautiful and the chair /cabinet it fun. Just enjoy them. or read your tea leaves for a value. Welcome aboard.