Brutalist wrought iron and copper wall lamp, Netherlands 1970s

Unique hand crafted brutalist wall lamp. The main design is made from wrought and welded iron with chunky pieces of crystal glass set in brackets.. It is mounted on a copper backplate. It has three E14 sockets. The entire front design is removable by 4 nuts on the back.
The origin is unknown but was probably made in the Netherlands in the 1970s.