In fact it is a custom version of our ANTHONY wall lamp.
For a library room, a cabinet with narrow pilasters, the client needed wall lights that would fit her narrow pilasters.
We came up with this design.
A classic French backplate in solid brass.
All finished in slightly aged gold leaf. 
Also looks good with shades.

10cm deep. 22.5cm high. Backplate 17cm x 3cm wide. ( we can make backplate in other dims) 

Backplate is not hollow, it is solid and flat. Wiring connection to be made inside wall or cabinet.