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, -
Review: Time Machine rolling ball clock
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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 -
Lot 3301 - A Congreave type rolling ball clock, height
A LIMITED EDITION THWAITES & REED 'CONGREVE' ROLLING BALL CLOCK – The Clock Work Shop
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Bonhams : A 20th Century Congreve rolling ball clock,
inclined-plane clock; rolling-ball clock; clock-case | British Museum