Diamante Crystal Regulator with Visual Escapement, 1904

• 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.
• Ormolu - Ormolu was popular with French craftsmen in the 18th and 19th century for ornamental fittings for furniture, clocks and other decorative items. True ormolu is gilt bronze, that is bronze that has been coated with gold using a mercury amalgam. Due to the health risks associated with using mercury, this method of creating ormolu was discontinued in France in the 1830s. A substitute was developed consisting of about 75% copper and 25% zinc, however it was inferior to the bronze version. It was often lacquered to prevent it tarnishing.
• Diamante / Rhinestone - A diamante and a rhinestone are both imitation diamonds made from glass, rock crystal or acrylic. Originally rhinestones were rock crystals mined from the Rhine river Rhine in the 18th century, but the term is now associated with any imitation diamonds. Diamantes and a rhinestones are used in costume jewellery, in clothing and accessories, and were especially popular in the 1930s,

This item has been included into following indexes:

• Ansonia (United States) - clocks, maker or retailer 320