Concord crown silver light fitting spotted in the wild

Spotted in a large bookshop in the centre of town - the shop mostly has flat LED panels and a few 1990's/2000's fluorescent fittings like the one in the photo, but still has a lot of interesting 1980's lighting, albeit redundant. I'd never noticed this fitting tucked away in a corner before, which appeared to have an EOL 100w crown silver lamp fitted.