Lyon-style two-handed cleaver; 29" overall with 5mm thick blade measuring 11" 6.5" designed for heavy butchery splitting. This style of cleaver was largely abandoned with the dominance of larger industrial meat processing. This is about as big as cleavers get.
Thiers, France at the Aine & Perrier Sabatier works. Aine & Perrier Sabatier (aka K Sabatier) has remained a family run business since its inception in the 1830's. The registered K trademark was recorded in 1834, making them arguably the oldest of the many Sabatier companies.