This quality 5.1/2" diameter nautical time and tide clock is made of solid brass and lacquer protected. It features a depth of 2" and weighs approximately 3 lbs. The movement is a dual quartz time and tide. The tide movement works off a 12 hour and 25 minute rotation for every 360 (degrees). Excellent choice for boats, sailboats, yachts and ships. The movement has a 3 year manufacturer's warranty. We also offer a 30-day money-back guarantee if you are not completely satisfied with the clock. Operates off one 'AA' battery. Easy to set and maintain. Instructions for setting the tide will accompany the clock. We carry rosewood clock plaques and brass engraving name plates to personalize it. We also carry walnut finish clock stands to fit.