An Eight-Day Clock is a mechanical clock designed to operate for approximately eight days on a single winding. Introduced during the seventeenth century and widely adopted in longcase, bracket, mantel and carriage clocks, the eight-day movement became a hallmark of quality timepieces due to its convenience and reliable timekeeping. Antique eight-day clocks remain highly sought after for their craftsmanship, engineering and decorative appeal. *Related Terms*\ Bracket Clock, Clock Movement, Longcase Clock, Mantel Clock, Weight-Driven Clock, Winding Key.