Does a 403 zigzag?
 

I am thinking of buying a vintage sewing machine. I have uhhh several, but I don't have one that zigzags.
Any help is

Yes, IF you have the zig zag cam for it. Here's a great link for comparing the 400 series. http://blog.sew-classic.com/2008/10/...ne-review.aspx

A Singer 403 is my go to machine - I love the simplicity - a post I made a while back - the same differences would apply to a Singer 401 & a Singer 403:
http://www.quiltingboard.com/main-f1...s-t160607.html

You need the "0" cam, the 403 & 503 have no cam stack and relies solely on cams for anything beyond a straight stitch.