Zigzagger Attachment for a straight stitch machine
Zigzaggers were an attachments produced when most machines were straight stitch only and allowed them to do a zigzag stitch.
They work by moving the fabric from side to side, driven by a lever on the needle clamp, as the machine feeds it forward.
This is standard type which was very popular and it includes an edge joinig plate which fits on the front.
Will fit almost any low shank straight stitch machine and all Singer models.