Made c.1685, the clock (6ft 7in high) features a 10-inch square signed dial and may be one of the maker’s first longcase clocks made with a skirted base.
The dial is described as “quintessential top-quality Knibb” and the movement is original with all the pillars and latches complete, and the original pendulum is also in place.
It is offered for a price in the region of £100,000.
Knibb was part of a large family of clockmakers, though his remain the best known and most collectable.
The group on offer from Wright includes two longcase clocks, two miniature lantern clocks and two table clocks. There is also a brass small lantern timepiece with an alarm by Knibb’s brother John in Oxford.
A total of seven Knibb clocks “is a remarkable statistic for a collection of any size”, Wright, who is based in Tetbury, Gloucestershire, says in the catalogue introduction.
The collection also includes an ebony striking table clock by Thomas Tompion numbered 155.
It is the earliest-known example to incorporate the maker’s twin subsidiary rings on his dial for pendulum regulation and strike/ silent, and the earliest-known clock to display the hand of an elegant backplate engraver who became known as ‘engraver No 155’.
Also to be found are a walnut and marquetry hooded wall clock by Christopher Gould, a month duration marquetry longcase clock by Jarrett with one and a quarter seconds pendulum and an ebony table clock by Henry Massy with month duration movement.