Anniversary clocks are named such because they were originally designed with movements that would run for 365 days between windings. These clocks became popular as gifts for weddings and anniversaries because the clock would run for a full year and the Bride and Groom could join together and wind it up on each wedding anniversary. Modern technology revolutionized clocks with the advent of quarts movements, which are extremely accurate on battery power. Virtually all anniversary clocks, including the one offered here, now come with quartz movements. Although it may not seem quite as romatic as key-winding their clock, happy couples can still celebrate their anniversary by joining together to change the battery so it will run for another blissful year!