English 18K gold open faced Lépine pocket watch Circa 1850

Gold lever pocket watch
–
A fine English 18 carat gold open faced lever pocket watch made by Christian Lange in London, circa 1850. High quality Lépine bridge movement with temperature compensation. White enamel dial with Roman hours, an outer minute track, sunk subsidiary seconds at 6 o’clock and blued steel hands. The case with lapis lazuli on the back and an applied gold monogram TM. Cuvette signed. 
–
Diameter: 40 mm
–
Weight: 48 g
–
Signed: Christian Lange 9. Salisbury Street, Strand London
–
Christian Lange of 99 Strand in London. Watch, clock and chronometer maker. Inventor of improvements relating to the winding mechanism of watches and clocks. Holder of the patent for a keyless watch and the gravity escapement for church clocks and regulators.
–
Originally from Denmark. Born in 1826 and died in 1895 in St. Pancras, North London. His wife, Johanna Barbara, was from Belgium.