The product is a new old stock FF 401 10 1/2 - 67 winding stem. The package is open and has only two inside. This part is crucial for winding the mainspring in a watch and is designed specifically for the FF brand. This winding stem is a high-quality replacement part for watches that require this specific component.
In good condition, new old stock; the package is stain a little due to age and storage. See images for details. For any questions regarding item don't hesitate to email.