Vintage YS Star Sewing Machine Zig Zag Attachment BX20

Original vintage Y.S.Star zig zag attachment and decorator for sewing machine.
Doing some research i think it dates back to the 1950's maybe 60's and is a japanese brand of sewing accessories, it fits almost any low-shank sewing machine and draws mechanical power via an arm connected to the machine's needle clamp. Its stitch pattern is controlled by a small flat rectangular metal template.
It's in very good condition and includes the box and instruction pamphlet which shows you how to fit it and adjust the stitch size.
It seems like it's complete but as i don't know much about it i can't give any guarantees. Read more