Boatswain Whistle This is a beautiful nautical bosun call or boatswains whistle. Some are still used by the British Royal Navy. Comes in a very attractive wooden box. Whistle measures approx. 4.75" long & 1" wide Made from brass & copper Wooden box measures approx. 5.5" x 1.75" x 1.5" Chain is approx. 30" long Fully functional or use as a decorative item