R.A. Lee, The Knibb Family: Clockmakers, Byfleet, 1964, pp.84-93
Alan Lloyd, The Collectors' Dictionary of Clocks, 1964, p.74, explains Dutch striking as, 'A form of dual striking where the hours are struck on a big bell and at the half hours the hour is repeated on a smaller, higher-toned bell. This method of striking is only possible with a locking plate... [I]t will be noted that the locking plate, (or countwheel) is notched in duplicate, so that the locking arm will allow a repetition of each number of blows. Dutch striking is not often found on English clocks and, as it is not practical with rack-and-snail striking, it soon dropped out after that system became generally adopted towards the end of the 17th century.'
Knibb table clocks with countwheels are rarer than those with rack-and-snail strike. See also a Phase III type Knibb Dutch-striking table clock of closely related design, sold anonymously, Christie's London, 7 December 2005, lot 85.