This is a fusee movement from an English Verge antique pocket watch from the 18th century. It is an unique watch handmade by Richard Lervis, a watchmaker from Wincanton.
It is not been established when the fusee was invented and it may not have been clockmakers that were the first to use the system. Quoting from Wikipaedia: ‘In a fusee clock, the barrel turns the fusee by pulling on the chain, and the fusee turns the clock’s gears.’
Images © Bip Mistry 2010