A MODERN MERCER EIGHT-DAY MARINE CHRONOMETER Thomas Mercer, No. 640N the silvered dial signed and numbered Thomas Mercer 640N , Arabic hour numerals, subsidiary seconds and up-and-down dials, blued steel hands, main diagonal frame assembly carrying reversed fusee and centre wheel, diagonal sub-frame assembly carrying the remainder of the train and Earnshaw escapement, Mercer flat strip spring detent to side of banking block with jewelled side locking stone, cut bimetallic balance, circular heat compensation weights, palladium helical balance spring, brass bowl and gimbal, in two-tier glazed mahogany box, with brass rectangular plaque to front of top section inscribed Supplied by E. Treitel & Co. Ltd., 69 Old Broad St. London. No. 640N 120mm. dial. diam.
A MODERN MERCER EIGHT-DAY MARINE CHRONOMETER Thomas Mercer, No. 640N the silvered dial signed and numbered Thomas Mercer 640N , Arabic hour numerals, subsidiary seconds and up-and-down dials, blued steel hands, main diagonal frame assembly carrying reversed fusee and centre wheel, diagonal sub-frame assembly carrying the remainder of the train and Earnshaw escapement, Mercer flat strip spring detent to side of banking block with jewelled side locking stone, cut bimetallic balance, circular heat compensation weights, palladium helical balance spring, brass bowl and gimbal, in two-tier glazed mahogany box, with brass rectangular plaque to front of top section inscribed Supplied by E. Treitel & Co. Ltd., 69 Old Broad St. London. No. 640N 120mm. dial. diam.
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