Jaeger-LeCoultre. 18k yellow gold Duo dial Night and Day…
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Jaeger-LeCoultre. 18k yellow gold Duo dial Night and Day wristwatch, Reverso Duo Night and Day, Ref:270.1.54, case No.1972635, Sold 9 November 2003 21-jewel manual winding movement, rectangular silvered dial with arabic chapter ring enclosing guilloche centre, subsidiary seconds, blued steel hands, the reverse silver guilloche and engine-turning dial with intersecting 12-hour and 24-hour arabic chapter rings, button in case band to independently set hour, characteristic reversing rectangular case with reeded ends, case, dial and movement signed, maker's brown ostrich leather strap and signed 18 carat gold deployant clasp, with maker's case, guarantee and instruction manual, 26.0 x 42.0 mm

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  • Chapter Ring - A separate metal plate on the face of a clock, on which the numerals for the hours and sometimes parts of the hours, are displayed, usually wheel shaped and sitting on top of the dial plate. The chapter ring is often a feature of the clock and can be silvered or enamelled to stand as a contrast to its background. The hours are usually shown in Roman numerals, although in the late 19th and earlt 20th century, Arabic numerals became fashionable.
  • Carat - A carat (abbreviated "ct") is a unit of measurement used to describe the weight of a diamond or other gemstone, and separately is a unit of measurement used to describe the weight of precious metals such as gold,.

    For gemstones, one carat is equal to 0.2 grams or 200 milligrams. The weight of a diamond is one of the Four Cs (along with cut, colour, and clarity) that are used to determine a diamond's value.

    It is important to note that a diamond's weight does not necessarily correspond to its size. A diamond's cut, which affects how well it reflects light, can make a diamond of a lower weight appear larger than a diamond of a higher weight. Additionally, the carat is not the only factor to determine the value of a diamond, other factors such as clarity, colour and cut are important too.

    In the gold industry, the purity of gold is measured in carats (abbreviated "ct"), with 24 karats being pure gold and lower carat numbers indicating a lower purity level. So, for example, 18 carat gold is 18/24 or 75% pure gold, and 12 carat gold is 12/24 or 50% pure gold.
  • Movement - The technical name for the workings of a clock or watch, and does not include the dial or case.
  • Guilloche - A form of classical decoration consisting of a repeating ornament of interlacing curved bands, sometimes forming circles, and further decorated with rosettes or other flower forms.

    The name is derived from the inventor, French engineer Guillot, who invented a mechanical method of inscribing fine repeating patterns on to metallic surfaces.

    On enamelled items with guilloche decoration, the surface is firstly engraved with the repeating pattern, and then covered with several layers of enamel, each of which is fired.

    Where the item has not been enamelled the form of decoration is usually called "engine turned".

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