An early 18th century Yorkshire 30 hour movement

An early 18th century Yorkshire 30 hour movement, striking on a bell to a 10in square brass dial, with a single hand and matted centre having turned and pierced rondels, with an engraved date aperture, the dial inscribe 'R. Henderson, Scarborough,' in a later oak and mahogany banded case, 79.25in (20cm) h.