In Britain, Hallmarking has a long history, dating
back 700 years and representing the earliest form
of consumer protection.
A Hallmark means that the article has been
independently tested by an Assay Office and guarantees
that it conforms to a specified legal standard of purity.
This is called the fineness of the metal and the precious
metal content is expressed as a millesimal number.
For example, the number 999 means that the metal is
99.9 percent pure.
I am now registererd with the Assay Office London and all my Silver work over a weight of 7.78g is Hallmarked with the following symbols.
PPD my sponsors/makers mark ie PPD for Purple Panda Designs
999 the purity mark indicating the fineness of the silver
'Cougar' which is the Assay Office London mark.
'l' the date mark for 2010