Hi. Back in the day nearly all heaters were Dealer install items so that one you have could have been used by dealers of many different brand cars. I have a round front one in my 45 Chevy Coupe that has similar looking emblem like the one on yours down the front & could be the same brand. Would have to wait till after daylight to go look to see. Mine has defrost that is operated by a small lever in the front. But I notice from you pics that the water lines are spaced far apart while on mine they are both near top center & about 2" apart & they do not go thru the firewall in the factory knockouts. Sometime soon when I get my Vintage Air unit installed I will have my heater for sale. For now I need it for the defrost/defog when it rains & I have the windows up. Jimmie