Hi Mike,
Sorry for the late reply, it went clean out of my head (It's an age thing!).
I'm not aware of the J. Brady of whom Jackson mentioned as working in 1803, of course it may well have been one of James's relations.
The only other Bradys I'm aware of that worked in the silver trade in Dublin are the family of Nicholas William Brady (b.1734 - d.1808)(see: Robert Calderwood at
http://www.925-1000.com/forum/viewtopic ... 5&start=35" onclick="window.open(this.href);return false;), his son Francis Tempest Brady (d.1821)(described as a gold & silversmith of 45, Dame Street, Dublin) and his son Sir Nicholas William Brady (b.1791 -Lord Mayor of Dublin 1839-40 - d.1843) who appeared to follow his grandfather's business as a manufacturer of silver thread.
I did wonder about the coincidence of Francis Tempest Brady's date of death and James Brady's registration (1821), but can find no other connection between the two at the moment.
Regards Trev.