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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, -
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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 -
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Bonhams : A 20th Century Congreve rolling ball clock,