Vintage unmarked silver metal lapel pin with an engraved fire engine that stands out in great detail. The textured background has a beaded edge. Thanks to a firefighter writing me with the correct information, I now know this is a cap device for a firefighters dress cap.
This firefighters screw-back cap device is in excellent, original condition. The back portion is marked 'Hook-Fast, Providence, RI' Size is 5/8 across.