Grandfather clocks., also known as hall, tall, floor or long-case clocks, are weight-driven clocks first made in England in the 1660s. They were among the most common early clocks in the colonies
because the settlers did not yet have mills capable of producing springs for spring-driven clocks. Grandfathers were large because they required a tall case to provide an adequate drop to run the clock. Those made in the colonies were copies of English styles.
Rich & Holt oak grandfather clock (American case, English movement), 30-hour, strikes hour on cast-iron bell, ca. 1920,19″ w. at top, 82″ h. $1,750.