Lalique France Opalescent Green 'Lierre' Bowl

• Registered Design - During the period 1842-1883 the Patent Office issued a diamond mark along with the registration number when a design was registered.
  
  Besides indicating that the design had been registered, a diamond mark offered the buyer the reassurance of knowing an item was of British design. It assured the person registering the design a degree of protection from copying.
  
  The mark was created to identify the type of material used (known as the class), how many items were included, (sometimes known as bundles or packages), and the date of registration.
  
  On the diamond mark the year of registration is shown along with the month code. However, there are two ranges of year codes; 1842-1867 and 1868-1883. By looking at the design of the diamond mark you should be able to determine the correct year from the design of the diamond mark and the placing of the day number.
  
  Source and further information: http://www.nationalarchives.gov.uk/records/research-guides/reg-design-diamond.htm
• Opalescent / Opaline - The descriptions of glass as "opalescent" or "opaline" are often used interchangeably by dealers and auction houses. At the upper end of the scale, opalescent / opaline glass can refer to the opal-like milky blue glass produced by Lalique and Etling. It also refers to the pressed glass mass produced in Britain from the 1840s with a milky white edge as sugar-basins, milk jugs and vases were made in great quantities for the mass market, and were sold at fairs along with Staffordshire figures and wooden dolls. A less common type of opalescent glass was made from two layers of glass blown into a mould.

This item has been included into following indexes:

• Lalique (France), item types - small bowls 326
• Lalique (France), patterns, vases - Grande Boule Lierre 4