Rolex Oysterquartz Day-date Ref 19018 an 18ct gold wristwatch with day and date and bracelet, circa 1986 dial: sunburst champagne calibre: cal. 5055 quartz, 11 jewels case: polished tonneau-form, screw down back and crown, fluted bezel case number: 9119700 Closure: Rolex 18ct gold oyster link bracelet and folding clasp dimensions: 36 mm diameter, internal circumference approximately 170 mm signed: case, dial and movement. Accessories: Rolex international service guarantee numbered 9119700, dated 27 August 2007, instruction booklet (in Japanese), certificate of authenticity, Rolex presentation box and outer box in the 1970s Rolex started to develop its first quartz movements. Prior to that Rolex had joined with other prominent watch manufacturers in the development of the highly accurate Beta 21 quartz calibre. In 1977, after five years of research and design, Rolex introduced their own masterful in-house quartz calibres, launched in the Datejust version (cal. 5035) as well as in a Day-Date version (cal. 5055), as illustrated by the present lot. Rolex discontinued their Oysterquartz wristwatches in 2001 and they were phased out of the retail market by 2003.
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- 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.
- Date Aperture - A date aperture is a cut out section in the face of a watch or clock, displaying the day of the month.
- 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.
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