A fabulous glass, vintage, illuminated, wall mounted, opticians eye chart.
A really unusual piece to have in the home. A fantastic wall lamp, plugs into a socket and can be operated by an in-line switch on the flex. 
Not just useful but decorative and a fabulous talking piece. 
As found, in working order. Has been professionally PAT tested. 
Measurements: 
26cm wide
56cm high
14cm protrusion from the wall.