Roger Dubuis 18ct Gold Diamond Limited Edition Wristwatch 1998
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Roger Dubuis, 18ct gold and diamond limited edition wristwatch, Bulletin D'Observatoire Ref no 01/28, movement no 1244, circa 1998, 25-jewel Cal.57, nickel automatic lever movement, stamped with Geneva seal, pierced rotor with Rd monogram, gilded dial, Arabic and Roman numerals, inner track for 24 hours indication, oversized 18ct polished pink gold rectangular case, diamond-set bezel, sapphire crystal display back secured by eight screws, case, dial and movement signed, with a fitted black leather strap and an 18ct pink gold Roger Dubuis diamond-set buckle, dimensions 34 x 46.5 mm
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- Bezel - On a clock or watch, the bezel is the metal frame into which the watch or clock glass is fitted. In clocks, the bezel may include a hinge and a flange, in effect a door to the face of the clock. In jewellery the bezel is a band of metal with a projecting lip that holds the gemstone in its setting.
- Gilding - Gilding is a method of ornamentation whereby a thin sheet of gold metal is applied to items made of wood, leather, ceramics, glass and silver for decorative purposes.
For furniture including mirrors, the sheet of gold is usually applied over a coating of gesso. Gesso is a mixture of plaster of Paris and gypsum mixed with water and then applied to the carved wooden frames of mirrors and picture frames as a base for applying the gold leaf. After numerous coats of gesso have been applied, allowed to dry and then sanded a coat of "bole", a usually red coloured mixture of clay and glue is brushed on and allowed to dry, after which the gold leaf is applied. Over time parts of the gilding will rub off so the base colour can be seen. In water gilding, this was generally a blue colour, while in oil gilding, the under layer was often yellow. In Victorian times, gilders frequently used red as a pigment beneath the gold leaf.
Metal was often gilded by a process known as fire gilding. Gold mixed with mercury was applied and heated, causing the mercury to evaporate, the long-term effect of which was to kill or disable the craftsman or woman from mercury poisoning. The pursuit of beauty has claimed many victims, not the least of which were the artists who made those pieces so highly sought after today. - Movement - The technical name for the workings of a clock or watch, and does not include the dial or case.
- Circa - A Latin term meaning 'about', often used in the antique trade to give an approximate date for the piece, usually considered to be five years on either side of the circa year. Thus, circa 1900 means the piece was made about 1900, probably between 1895 and 1905. The expression is sometimes abbreviated to c.1900.
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