Cartier Ref 2988, a fine and rare 18ct gold and diamond-set 'Ballon Bleu', automatic wrist watch with silvered guilloche dial, date and Integrated bracelet, property of a private Sydney collector, Manufacturer: Cartier, year: circa 2010, reference no: 2988, case no: 112777QX, model name: Ballon Bleu, material: 18ct gold and diamonds, calibre: automatic cal. 049, 21 jewels, Bracelet/Strap: 18ct gold, no: Ceok 12H, Ceok 6H, maximum length 120 mm, Clasp/Buckle: 18ct gold Cartier double folding clasp, dimensions: 42 mm diameter, signed: case, dial, movement and clasp signed, accessories: box,
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- 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.
- 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".
- Date Aperture - A date aperture is a cut out section in the face of a watch or clock, displaying the day of the month.
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