Vintage 1978 ARROW HANDICRAFT #675 ELECTRIC ROLLING BALL CLOCK Brown | eBay
Idle-Tyme. The Original Rolling Ball Clock
Mid 20th century 'Congreve' rolling ball clock, sloped arch and pierced brass movement, the central Arabic minute chapter ring flanked by hour and seconds dials, twin train driven eight day movement, -
KinetiClocK Rolling Ball Clock - YouTube
Mechanical Rolling Ball Clock -- Gadgetify - YouTube
Devon Clocks - Congreve type brass 'Rolling Ball' clock, with Arabic hour, minute and second dials, four turned pillar supports, on mahogany plinth, under glass, designed by Sir William Congreve in 1 -