I believe that this Horsham branch of the family may descend from the eldest son of William Mussell of Hurstpierpoint (see Ashurst Tree).
In 1735, at Bolney, Elizabeth widow of gunsmith Cornelius Muzzell, married John Inkpen, the Horsham Clockmaker. Through this marriage, Cornelius's 2 sons became clockmakers. John, born 1730, made the Tavern Clock on the landing of Horsham Museum, as well as other clocks and watches. He was buried in 1789 at Horsham.
Cornelius II continued the family's clockmaking tradition and he worked at 2 or 3 West Street, Horsham, in the 1790s. One of his Long Case Clocks is in the Museum's Library: the dial was made by Osbornes Manufactory, Birmingham, 1790-1795.
The Museum also has several receipts for repair work carried out by the Muzzells.
The IGI indicates that some of the family may have subsequently moved to the London area.