John Walker, London.

The substantial two-week single fusee movement has thick plates, substantial turned pillars, winding arbors out the front and back and well-cut six-spoke wheelwork with substantial screwed collets. Finely threaded screwed adjustments adjust the tilt and pin release for the thirty second tray suspended by knife-edge below.

Sir William Congreve (1772-1828) was a prolific inventor whose horological pieces are housed within the Royal collection. His patent for the rolling ball clock is dated 1808