That's an aftermarket "Walker" radiator, make in Tennessee. They went out of business 2 or 3 years ago, but were around for many years. That very well could have been in a '38 Buick that may have been modified or hot rodded as evidenced by the electric fan and automatic transmission cooling line fittings in the lower tank and air conditioner condenser in front. Walker would ask "What kind of car, and what kind of engine are you putting in it" and custom build it to fit. High quality Copper / Brass construction . 3 or 4 core, trans cooler, pick your inlet / outlet sizes, whatever you wanted.
One was in a '38 Chevy Street rod with a small block V8 when I bought it. I was happy with it. On my '37 LaSalle (Stock factory drivetrain) I finally got fed up with poor cooling an endless leak repairs so I thought I'd give them a try. They were surprised when I told them the engine was a Flathead Cadillac V8! My temp gauge very seldom goes much past center, and I can use a coolant recovery tank instead of puking antifreeze all over the ground. A good product! Joe G.