This Swiss Singer Automatic Zig-Zag Attachment is complete and in excellent condition and is complete.
The Singer part number is 160990.
For more information on this zig-zagger see my blog on the Swiss Singer Automatic Zig-Zag Attachment.
It comes with the ten original different zigzag cogs.
Originally the zigzagger had # 1-5 cogs and then the #6-10 cogs were purchased later
The Bakelite case is in excellent condition with no cracks.
The attachment not only zig-zags and sews a straight stitch but has feed dogs so that it can be used as a walking foot.
This is the best zig-zag attachment that Singer ever made.
All listings are in US dollars.