Dent, London, England, "Congreve Rolling Ball Clock", 8 day, spring driven, fusee movement with maintaining power is regulated by a rolling steel ball traversing an inclined plane every 15 seconds, tripping a lever, tilting the plane in the opposite

Dent, London, England, "Congreve Rolling Ball Clock", 8 day, spring driven, fusee movement with maintaining power is regulated by a rolling steel ball traversing an inclined plane every 15 seconds, tripping a lever, tilting the plane in the opposite direction, while registering 15 second intervals on the right dial, minutes on the center and hours on the left all on a marble base in a Plexiglas case, dated 1973 this clock, one of a limited edition of 150 reproduced by Dent in the 1970's, is a replica of the original patented by Sir William Congreve in 1808. It is running and in excellent original condition with one small crack in lower corner of Plexiglas case. It is engraved on the back plate "ANDREW FELL DEL. 1973 SER. No. 132" and the front has Dent signature on a silvered plate. Ht 17 1/2", Width 19", Depth 14 1/2"