Mary Ann Sugiyama is registered with Goldsmiths’ Company London Assay Office which has a legislative remit to control standards of precious metal being sold in the UK.
Mary has her own recognised hallmark which is struck by London Assay Office on her sterling silver pieces weighing over 7.78g.
A hallmark is proof that an item is of the standard of fineness.
Here is an example of Mary’s hallmark.
Next to her initials “MAS”, you can see a lion symbol that stands for sterling silver. These are followed by the fitness mark – “925” (not very distinct); then the Assay Office mark – a jaguar’s head which stands for their London office; and finally a date letter “t”, indicating the year of stamping as 2018.
Please refer to the below notice from Assay office for interpretation of all the symbols.