Wrights Invisible Zipper Foot Attachment Vintage Promotional Item Universal. Transforms standard zipper foot to an invisible zipper foot.  "Special introductory offer".  What makes this item much more rare is that it was given as a promotional item, FREE, with the purchase of Wrights Self Basting Invisible Zipper.  Has instructions on back.  In original packaging, but there is a tear in plastic above the foot (see photos).  Item # 172 001. Originally sold for 29 cents.  It was designed to fit most current sewing machines (of that time). Wrights invisible zipper attachment was also designed to fit other brands of invisible zipper. Free shipping. VOLUME PRICING.   Thank you!