Each instrument is labeled with a unique serial number  The elegant Anniversary Collection of ships clocks and barometers was introduced to commemorate 75 years of the rich heritage of Weems & Plath, which is closely linked to its founder, Captain Philip Van Horn Weems, who strove to perfect the field of navigation. Elegant instruments in gleaming solid forged brass cases. Quartz clock strikes the hour wth ships bells. Barometer has a highly reliable and accurate double diaphragm German aneroid movement that is visible through the open dial. It displays both of the barometric scales, inches of mercury and millibars. The movement is temperature-compensated and calibrated for altitudes up to 3,500 feet above sea level. Complete instructions and mounting hardware are included. Case Material: Solid brass Movement Type: Quartz clock, aneroid barometer Dial Diameter: 5-1/4" Case Depth: 3" Case Drilled for Mounting: Yes Warranty: Limited lifetime