Birmingham bicentennial commemorative The mark letter changed annually in May, the cycles of date letters were usually in strings of 20 and each cycle was differentiated by a changing of the font, letter case and shield shape. The hallmark of the Limerick silversmith Joseph Johns. Glasgow tree, fish and bell Items bearing British Import marks will sometimes have additional marks from the country of origin, sometimes not.
The date letters were changed on the day that the Goldsmith's Guild wardens were elected, originally St Dunstan's Day 19 May until the Restoration and 29 May thereafter.
LONDON DATE LETTERS CHART / SILVER HALLMARKS UK
London Hallmarks. Today there are still offices in Edinburgh, where hallmarking has been regulated since the 15th century, and in Birmingham and Sheffield, where assay offices were established by an Act of Parliament in Until then, assay offices changed punches at different times of the year, so most letters were in fact used across two years. The silver hallmarks struck for Alexander Cameron of Dundee. Sheffield Hallmarks.