1926 London Assay Sterling Silver Enamel Desk Clock, Swiss Movement
A fine guilloche enameled and sterling silver cased desk clock, Swiss 8 day spring driven movement. (working when catalogued). Sterling silver surrounding the whole marked for, London assay, 1926, makers mark 'R.C'. Dimensions: 2.95 in. x 3.94 in.
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- Sterling Silver - Sterling silver is a mixture of 92.5% pure silver and 7.5% of another metal, usually copper. Fine silver is 99.9% pure silver, and is relatively soft and the addition of the very small amount of copper gives the metal enough strength and hardness to be worked into jewellery, decorative and household objects.
- Movement - The technical name for the workings of a clock or watch, and does not include the dial or case.
- Assay / Assayed - Assaying is the testing of a metal, most commonly silver and gold to determine its ingredients and quality. In Britain, once an item of silver or gold has been assayed, a mark is stamped on it, certifying its purity. Known as hallmark, it derives its name from the Guild Hall of the Goldsmiths' Company, who recieved its Charter in 1327 giving it the power to assay and mark articles of gold and silver.
- 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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