Swiss gold plated, keywind, jump hour, cylinder pocket watch by Courvoisier Freres (Swiss 1842-1882), 1.89 in. slim case with engine-turning. Gilt inner dust cover engraved 'Echappement a Cylindre, Quatre Trous en Rubis, No.26229, Courvoisier Freres'. Machine engraved 'Clous de Paris' guilloche surfaced silver dial, with digital jump hour aperture, above an eccentrically positioned minutes chapter with Arabic numerals at the quarters, gold Breguet hand, sunken subsidiary seconds dial at 30.
- 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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