Striking longcase clock movement by John Harrison, Barrow-upon Humber, North Lincolnshire, 1713. Oak dial with brass chapter ring and spandrels, and date aperture. Signed on the chapter ring 'John Harrison, Barrow, fecit'. The winding hole is concealed behind the lower spandrel. Movement of eight-day duration, with anchor escapement. The frame and most of the wheels are made of wood. Signed ‘Jon Harrison 1713’ in ink on the calendar wheel. Earliest known eight-day longcase clock movement by John Harrison 1713