That is really neat. I have never seen one before. I have seen a hand pump brass fog horn, brass steam whistles, and a buoy bell which was rung by four outside the bell clappers with the wave action, but never a wave action activated whistle. It must have gotten lots louder in a storm. I have a buoy bell in my collection inscribed by the foundry, city of casting and year as well as USLHS, which stood for U.S. Light House Service. It has two 1/2″ diameter pock marks and a 1/2″ hole in a straight line, equally spaced. I am pretty sure some navy guys decided to ring the bell with a 50 caliber machine gun. The normal ammo belt has 3 rounds of ball ammo, a tracer and an armor piercing round. The bell is damaged, but the damage is at and above the waist so the tone is little affected. Besides, they cast buoy bells extra thick to withstand the constant wear of the clapper on the bell, so the tone wasn’t very good to start with. It is fun to have the story and think about some young navy guys looking sideways at each other, then doing it.