This is an old thread, but for anyone searching, there is coverage of the Deny lock in PULFORD, G High security mechanical locks pp414-5.
This is a lever cylinder mechanism derived from the Davis lock of 1799 UK2306, containing both wards and levers. Many key steps are redundant, but the lock despite not being high security is useful for its weather-resistance.
The company was founded by Charles Dény, and operates in Picardy.
This lock is not like the Italian-style doublebit locks also seen in Europe and elsewhere.