7" Brass twelve-twenty four Hour Clock with matching Hygrometer-Thermometer and Mahogany stand. The solid brass cases have been doubly protected with a zirconium plating based on chromium plating. No polishing needed and will never tarnish or discolor. This quality brass clock would be an excellent choice for any marine boats to add classic nautical flair and functionality. The clock works with a quartz movement which requires one AA battery. The movement is accessed through the working, hinged porthole.