Dial fully engraved with 12/24 layout, steel blued hands. Case is inset hinged bezel type with original satin nickel finish. Mechanical movement is mint perfect and in good running order. Chelsea made this type clock circa 1948 in very limited quanities for the U. S. Navy for shipboard use and Pan American World Airways for use in their air terminals. This clock comes complete with the only known factory amplifier and speaker system. A transducer in the back of the case picks up the vibration of the gong and sends it to the amplifier for amplification and on to the speaker. Comes with one speaker but the system can handle multiple speakers. The clock comes with its factory designed 18" mahogany surround for wall mounting and also a birdseye maple stand for shelf mounting. The system is fully operational and in good working order. The tone of the ship's bell thru the speaker system is wonderful. Matching serial numbers, 559066, listed in Demeter's book, "Chelsea Clock Company, The First Hundred Years" on page 117. Demeter states that these outfits are "Extremely Rare". This outfit would be an exceptional addition to your nautical theme room, boat house, radio room, or yacht club. Comes with supporting documentation from Chelsea on system setup and operation dated 1948.