This item is a Stauffer grease lubricator cap, a vintage industrial component used for manual lubrication. The top is embossed with "STAUFFER'S PATENT", referring to the Stauffer grease cup, a widely used lubrication system. This devices typically consist of a threaded base and a screw-on cap. As the cap is turned, it forces grease into the machinery's bearing. The cap unscrews easily and can be seen in the photos. Its condition can be seen in the photos as it shows signs of aging. It measures approximately 5cm wide by 6cm tall. It weighs approximately 120g.
