Moulded plastic double pole switch.
The red window at the top has a neon indicator behind, which would be illuminated when the switch was on.
The two screws on the front only secure the plastic plate to the switch body - the screws holding the switch to the wall box are concealed behind the plate.
A single earth terminal is provided, which connects to a metal strap holding the switch assembly.
This strap also holds the screws which secure the switch to the wall box, and the smaller screws to secure the plastic front plate.
The yellow insulated wires connect to the neon - wired in parallel with the load.
Maximum rating 20 amps, Made in England.