Solid brass Time and Tide clock and matching Thermometer Hygrometer set with Mahogany wood stand. The solid brass cases have been doubly protected with a zirconium plating based on chromium plating. It will never tarnish or discolor. This quality brass clock would be an excellent choice for any marine vessel, home or office to add classic nautical flair and functionality. It features a depth of 3.5". The clock works with a quartz movement which requires one AA battery. The movement is accessed through the working, hinged porthole.