This old sewing tool is a vintage needle threader.
The thin wire loop was pushed through the eye of a sewing needle. Thread was then placed through the larger wire loop, and the tool was pulled back through the needle, bringing the thread with it.
Needle threaders were especially useful for tiny needle eyes or for anyone who found threading a needle difficult.
Simple versions of this handy sewing aid are still used today.
The correct answer is a vintage needle threader.


