Pocket watch, with silver case and pair case, and tortoise-shell outer case, from Edward Prior, clockmaker, London late 18th century?

Pocket watch, with silver case and pair case, and tortoise-shell outer case, from Edward Prior, clockmaker, London late 18th century?
Pocket watch, with silver case and pair case, and tortoise-shell outer case, from Edward Prior, clockmaker, London late 18th century?