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Index No. A6034 Marine Chronometer by Dent with 24 Hour Dial
A 19th Century two day marine chronometer by Dent with a 24 hour dial in a brass bound mahogany box with brass corners.  Full plate keywind fusee movement, four turned pillars secured by blue steel screws.  Harrison's maintaining power with blue steel click and spring, blue steel barrel ratchet wheel and double toothed click on the barrel bridge.  Plain cock with garnet endstone, two arm compensation balance with two circular weights, small timing screws and large timing nuts, freesprung blue steel helical hairspring.  Earnshaw spring detent escapement, escape pivots with endstones.  The movement secured to the gilt dial plate by three blue steel screws.  Engraved signed and numbered silvered brass dial with Arabic numerals for 24 hours.  Subsidiaries for seconds and power reserve indication, Roman numerals, blue steel hands.  Turned brass bowl, sprung hinged shutter to the winding hole, screw brass bezel with flat glass.  Brass gimbals and locking mechanism, later brass key.  Three tier mahogany box, hinged flush brass handles and corners.  Circular signed and numbered white enamel plaque above the lock.  Pasted in the lid a certificate from E Dent, 61 Strand & 34 & 35 Royal Exchange details their appointment to The Queen, Prince of Wales and Emperor of Russia and various medals.
SignedDent 61 Strand   London   Chronometer maker to the Queen   3047
ConditionCirca 1870
CaseExcellent.
DialExcellent. Dimensions 175 x 175 x 170 mm
MovementGood, the escapement replaced and some surface rust to the hairspring.
Marine Chronometers with twenty four hour dials are very uncommon.  They do not seem to have any advantage over normal twelve hour dials as the most important indication would be the seconds hand and then the minutes.  A navigator who did not know whether it was six in the morning or six in the evening was already lost!
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