There is record of a Thomas Leigh making a watch in Bolton in 1781, to date no other records of Thomas have been found, it is possible he was part of, or moved to join other Leigh family members in the wider Lancashire area who were engaged in Watch making at the time and later.
A watch typical of the type that would have been made by Thomas Leigh in 1781. Whilst this one is not by him, this would be very similar to what he would have produced.
