[3] The original structure was built as a chantry chapel sometime before 1283 and dedicated to St Mary, perhaps for Edmund, Earl of Cornwall.

[4] The St Mary's chapel was still performing its original functions of ministering to the burgesses and keeping obiit for the soul of its founder in 1556, however by 1557 it had been seized by Edward VI under the Dissolution of Colleges Act 1547 and sold to the town; thus sharing the same fate as the St Mary's chapel of Penryn, which occupied a similar position in the middle of the main street.

By the 1790s the medieval building was seen as inconvenient for the modern town, and following the 1796 general election, Charles Abbot, the newly returned member for Helston, had "desired not to give any election entertainments, but to commute that expense for a subscription of 200 guineas to remove the Coinage Hall and rebuild it in a more convenient part of the town".

[4] The new coinage hall, situated at 53 Coinagehall Street was built for this purpose in the early 19th century and still survives, later having been used as a Duchy Office and surgeon's house.

[7] The site of the original coinage hall, once demolished, was used as a cattle market and ceremonial approach for the Grylls Monument.