And that one is NG. You can see the gas line to the left of the grill.Looks like a lot like a Broilmaster. If built similarly that explains why it is still out there rather than in a pile of rust.
I grew up in North Jersey...15 miles or so West of NYC. Our house was probably built around 1915 or so. My father had the plumber run a gas line out the basement wall, under a concrete sidewalk and about 12" in from the sidewalk, he had a NG Charmglow which was pretty much what you described.Back in the day all the grills were made on the same formula. Heavy cast aluminum fire box, a flame control of some type (lava rocks, ceramic briquettes, etc) a dual high heat burner, lid prop and varying types of rack arrangements. It's why when the "real" Genesis showed up it really was a "Genesis" (or a new beginning) rather than the same old same old formula of grill building there had existed for the previous 30 or 40+ years. My father in law bought a home in Richfield MN in the late 50s. part of the suburban expansion we saw so much of back then. It was brand new. The builder had installed a copper gas line behind the back door and a post mounted Warm Morning grill was set right in the concrete.
But Weber changed all that with the Genesis. Now? They're back to doing the same formula everyone else does.