In the early 15th century, clocks of smaller size started to be produced. They include wall clocks, table-clocks and watch. Through the 17th and 18th centuries clockmakers in France, Germany and England developed new mechanical devices such as springs, gears, balance-wheels, escapements, and regulators, which led to constantly smaller and more precise timepieces. Most of the watches in the Tommaso Ruscitti Collection are pocket watches made between the late 16th and the 19th century by very prestigious clockmakers such as Augustin Forfaict (16th cent.), Abraham-Louis Breguet (1747-1832), Daniel Delander († 1733), John Ellicott (1706-1772) and Josiah Emery (ca. 1725-1797). They do not belong to either the Medicean or Lorraine Collection but were donated to the museum at a later date.