Original: In 1877 "Vacheron & Constantin, Fabricants, Geneve" became the official name of the company.
Simplified: The name of the company became – "Vacheron & Constantin". In 1839 Georges-Auguste Leschot joined "Vacheron & Constantin". In 1877 the company officially changed the name for "Vacheron & Constantin, Fabricants, Geneve".