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Chief designer was Edward Napier Hitchcock Spencer.
Town marks for imported silver have differed from the normal marks since
Unfortunately, Brugnatelli's inventions were repressed by the French Academy of Sciences and did not become used in general industry for the following thirty years.
Having identified the city mark, click on the link to its date chart and find your Date Letter.
My thanks to everybody who has provided feedback.
If you are unable to identify the assay office from one of the town marks below you may have a piece of imported silver.