Caslon and Son
1792 William Caslon III, son of William Caslon II, late proprietor of the Caslon Foundry, purchased the foundry of the recently deceased Joseph Jackson in Salisbury Square and renamed it Caslon & Son, so that between 1792 and 1818 there were two distinct Caslon foundries in London
1807 Caslon & Son was passed to William Caslon IV
1819 William Caslon IV sold Caslon & Son to the new Sheffield foundry of Blake, Garnett and Co