Machines et appareils Konnen in Diekirch, Luxembourg made small machinery, precision instruments and gun barrels. Apparently, it also produced cast-metal models.
It started as a foundry, its history going back to 1863, with several different owners in that time. All this can be read on the website linked to.
The model shown was probably made on order in the workshop in Diekirch, I doubt Albert Konnen had a hand in its design.