Set of Two Thomas Mercer of St. Albans England Marine Chronometers with papers and boxes as well as secondary transportation nesting boxes. Manufactured in 1980. It is rare to see these in this good condition with documentation. Sets were and are sold to ships in order to have one check the other for more accurate time keeping. Time pieces such as these are used in celestial navigation that is plotting of vessel position based on stars. It is important to have the most accurate times for use to plot the most accurate position. Mechanical clocks do not run out of batteries. Strict winding regiments are kept. Time for both is set and checked on long range single side band radio. This radio is used to listen to the Greenwich, England Mean Time (GMT) "time tick" daily. 

       These are in EXCELLENT condition. In beautiful shape and keep time well. Own this unique and rare set for the home office, yacht, ship, museum, or man cave. Mechanical clocks and watches make an excellent investment as they do not loose value. These will be ticking long into the future. The clocks them selves can be removed from the gimbaled containers and easily placed into any sort of mounting you care to fabricate. Thomas Mercer is THE Marine Chronometer makers in the world. Rare and hard to come by. Please see their website for more information on the brand. This is from their website: "Thomas Mercer: AHEAD OF OUR TIMES SINCE 1858

When Ernest Shackleton and Francis Chichester embarked on their feats of navigation, they relied on our chronometers to determine longitude. When adorning the luxurious interiors of HMY Britannia and Winston Churchill’s aircraft, Thomas Mercer was the choice to go. Today, we reinvent our dashing heritage through sophisticated astronomical movements that pay homage to the indissoluble link between the sea and the stars."  Feel free to reach out with any questions. We want to make sure you are fully satisfied with this purchase.