And Thomas B Pratt's wife, Elizabeth Copland (1749-88) had at least one engraver apprenticed under her own name (5 Jul 1770 - Henry Taylor). Source: Register of Duties Paid for Apprentices' Indentures, 1710-1811/Ancestry.
Thanks Trev. I should mention that Thomas Boulton Pratt's wife had died, so his relationship with Elizabeth Matthews was probably more one of a common law wife. -- In Thomas Boulton's will, 1739, he wrote: "I give and bequeath unto my two most esteemed friends and intimate acquaintances Wilmer ...
I know this reply is almost 10 years after the original post, but in case anyone is interested: Thomas Boulton Pratt was the nephew of Thomas Boulton, who was also a goldsmith. Thomas Boulton died with no heirs in 1739, and in his will, he made a bequest to his nephew Thomas Boulton Pratt. Thomas Bo...