This is a Vintage Zip Aid Zipper Assistant - Women;s Dressing Tool - New York - Zip Your Dress By Yourself!
The purpose of this handy chain tool is to hook on to a long dress zipper and zip it up without the aide of another person. There is a cover over the end of the alligator clip to prevent any damage to cloth. The other end has a larger ball to put between your fingers to pull it. The bead chain is made of brass.
The chain with the clip measures 26'' long.
If you need help zipping up your own dress, then this little gadget can be a big help. You pinch the clamp onto your zipper and pit the chain over your shoulder. With one hand hold the bottom of the zipper for tension and pull the chain to pull the zipper up.
There is a picture showing the instructions, but, the instructions are not included.