Yeah, that looks like an Amp low voltage relay for lighting. Here in NJ back in the 60's, many electrical contractors (EC) would install these low voltage (LV) relays in the attic. Then at every door there was a LV switch to turn on the lights. You could have 1-5 switches at any point in the house. You could control any/all of the outside lights from any spot in the house. I must have seem real high tech at the time.
