Double Roller Lever Escapement

The onyx base is raised on gilt feet, with key wound going barrel, train with lantern pinions, straight line escapement with club tooth escape wheel, banking adjusted by means transverse screws, gilt balance with poising screws and overcoiled spring, decorative red endstone. The lever escapement was invented by Thomas Mudge in 1750, and has been the principal escapement used for watches since the 19th century. It increased accuracy; and when gently shaken, will self-start. The double rollers reduce friction.