Crabtree socket outlet with ceramic back and polished brass front plate.
The front plate is polished brass, with black plastic insulators for the socket holes.
Rated 5 Amp, 250 Volt.
Mounting holes are at 2 inch centres.
Note the wording on the box flap typical of wartime products - 'please save this carton for salvage' indicating this was probably made in the 1940s.