Double unswitched socket outlet and moulded backbox.
Two socket outlets, unswitched. Both have the oval MK logo inside a recessed circle between the holes.
The backbox is complete, other than a hole in the centre where the cables entered from inside the wall.
The hole at each side edge is the same pattern as sockets made today.
This was fixed over a flush mounted single metal box using the two smaller holes either side of the central cable entry.
This is a quick way to convert a single to a double.
Today, specific converter sockets are available for this purpose, which are considerably slimmer than this example.
The top two fixing screws are connected to earth - the lower two are not.
13 AMP 250V. Made in England.
Part numbers: socket plate 6727, brown socket back moulding 6726, backbox 2032.
As with the plastic box, the 6 lug metal boxes are no longer made - modern ones just have the two fixing holes, one at each side.
Note the earth holes (top) which have the metal contact extended forward to be flush with the front plate.