John Hyatt, London silversmith, apprenticed to James Gould 1733, free 1741. Mark entered as large worker 1742. Second mark in partnership with Charles Semore 1757.
Charles Semore, London silversmith, no record of apprenticeship or freedom. Mark entered in partnership with John Hyatt 1757. Semore (or Seymour), was also in partnership with William Lancaster in 1773 as smallworker without any mark struck.