This is an NOS illuminated Lucas push-pull switch, complete with bullet connectors. They were typically used for foglamps or reversing lamps of the 1950's, '60's and '70's. The white center is illuminated when the switch is on.
We have several of these switches; the pictures show representative examples.
We also have used black and NOS ivory illuminated switches, as well as new and original non-illuminated push-pull switches.