Chelsea Clock produced its WWII-era engine room clocks more than 80 years ago, and those clocks are still used by the U.S. Navy today. Known for precision and durability, the clocks serve as meaningful reminders for those who have served. Recently released to the public, this 8.5-inch Naval Deck Clock has an American-made 12E mechanical movement and heat-resistant phenolic resin case. Every 12E movement is made by hand in Chelsea, Massachusetts; it takes nearly six weeks to manufacture, assemble and test.