Swiss side lever, so-called cal. IV, about 1840. Interesting shock absorbing system is called parachute and

was invented by A.L. Breguet and used quite often with swiss and french watches. There is also a tempertaure

compensiation curb (a principle inveted by J. Harrison, but widely used after 1800) T movement,

which clearly has been imported from Switzerland or France, has been finished in England.