An older example, this design is still available to buy new.
Pins are sleeved.
This design was also made with various other logos on the lid, mainly those of electrical appliance manufacturers.
The terminals are the style where the wire is wrapped around a post and a clamp screwed on from above.
Pins are identified with L N E, and the oval MK logo is positioned at the lower centre.
This style of plug is still manufactured, the only difference being the MK logo is the modern rectangular one.