This was found at the estate of a retired Senior Chief Machinists Mate in Mount Pleasant SC. I can attest to both its authenticity and its working condition. As to authenticity, I spent several years riding 616 class Ballistic Missile Submarines. This is the exact diving alarm and momentary switch installed on that class and I have heard it on dozens of occasions. It is incredibly loud, nearly 130 db. This one, like every operational one I have ever seen, was packed with wipes, paper towels, and covered with a metal plate to muffle the sound. Those items have been removed so that its full volume can be enjoyed. A must have for the submariners den, bar or man cave. About 30 of power cord is included and is currently wired and operational. The item “Authentic US Submarine Cold War era Diving Alarm Klaxon” is in sale since Sunday, August 07, 2016. This item is in the category “Collectibles\Transportation\Boats & Ships\Military\Other Naval Collectibles”. The seller is “tootiejim” and is located in Ridgeville, South Carolina. This item can be shipped to United States, to Canada, to United Kingdom, DK, RO, SK, BG, CZ, FI, HU, LV, LT, MT, EE, to Australia, GR, PT, CY, SI, to Japan, to China, SE, KR, ID, to Taiwan, TH, to Belgium, to France, to Hong Kong, to Ireland, to Netherlands, PL, to Spain, to Italy, to Germany, to Austria, RU, IL, to Mexico, to New Zealand, SG, to Switzerland, NO, SA, UA, AE, QA, KW, BH, HR, MY, CL, CO, CR, PA, TT, GT, HN, JM.