It's a Japanese copy of Singer's model 15. If you google the words "
badged model 15 clone" you will get lots of info. There's several threads here on the quiling board forum. They usually need a bit of cleaning and oiling before they run smothly again. On ismas there's a
generic manual for them, several others will turn up of you search for it.
Here's some nice info too. There's a lot of variants on it, typical is the tensioner adn take up lever on the side of the face plate, and they all take standard class 15 bobbin and bobbin case.