Boatswain's whistle brass/copper antique wooden box, boat whistle with signal instructions, for high-ranking guests and collectors

The bosun's task is to blow the whistle when high-ranking guests come aboard. The tone indicates the guest's rank. Fully functional equipment in a wooden box. Naturally, it comes with detailed signaling instructions. With chain. Material: brass/copper. Bosun's whistle dimensions: approx. 12 cm. Wooden box dimensions: approx. 16 x 5 x 4 cm.