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Lot No. 335 (86th Auction)
Invented by Sir William A. Congreve-Bart, Patented in 1808, Height 290 mm, circa 1820

A spring driven rolling ball clock, one of a small series made to Congreve's basic design in the 1820's. It has separate dials for minutes, hours and seconds, the latter marked 0 - 30 and 30 - 60 to coincide with the 30 seconds table. Apertures at the end of each straight run show the seconds.
Case: brass, chromium plated, polished, milled see-saw for rolling ball. Dial: silvered, dial for hours, minutes and 30 seconds indication, blued steel hands. Movm.: pediment shaped brass frame, polished, chain/fusee, Congreves patented escapement.

A nearly identical clock is illustrated and described in: Derek Roberts: "Mystery, novelty, and fantasy clocks", 1999, Schiffer Publishing Ltd., page 68ff.
Estimate  3,000 - 5,000 €
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