Perhaps the most eye-catching feature used on early English clock dials was the skeletonised chapter ring.
Seldom used by Joseph Knibb his skeletonised dials were reserved for 'special' clocks which often employed unusual strike systems or movements of particularly long duration. Although skeletonised chapter rings had been in common use on the Continent at this time, very few London clockmakers made them. Amongst those who did were Thomas Tompion (1639-1713), Henry Jones (1642-1695), William Clement (1643-1709) and Joseph Knibb. They were extremely time-consuming and delicate to make and therefore expensive. But no one made them better than Joseph Knibb and as if to emphasise this point he occasionally made one in silver. The present clock has a two train movement yet still manages to strike the hours and quarters - and run for a full week. The alarm train would have been a special (and expensive) request by the original owner; most table clocks with alarm were made with going trains only, very few were made in addition to a strike train. The combination of the alarm and the two-train quarter strike is extremely rare
See also lots 70 and 88 and footnotes.