The date letters below show the background shape for silver.
The same letters were used for Gold, which has been marked in Birmingham since 1824, but with a background of a square with cut corners.
There may be some variations in backgrounds during the late 19th century, especially on watch cases.
Depending upon the font used for the series of date letters, the letter i, j or l is usually omitted to avoid any possible confusion between them.
Scouring online resources offers a wealth of information on sterling silver and silver plated wares to assist you in your research tasks.
But, to be honest, some are much better than others.
I would like to know why the seller of the ring believes that it is from the Art Nouveau period.Until 1961, Danish silver was identified by a stamp with three towers. (A mark with two towers means silverplate.)Other hallmarks can also include Swedish year markings and The Designer Initials which can further assist in dating a particular item. Not all items with a Georg Jensen hallmark may in fact be original pieces.In some cases, some items on the resale market are an amalgamation of Georg Jensen items and either original silver work, or the silver work of other companies.Under the Danish Hallmarking Act of 1893, the content standard for all silver was set at 826 parts out of 1,000, which is slightly lower than the standard for sterling which is 925.The remainder is usually copper with very small amounts of iron, lead and traces of other metals.In Part I, I gave a brief history of the development of the British silverplating industry in the 18th and 19th centuries.