I found this in a 51 Chevy truck. It's not an electric heater. It has coolant lines going too and from. It looks like it has a two-speed fan control and a knob to control the defrost.
I went out and took a closer look at it to see if I can find a model number or anything that could identify it. To my surprise, I did find one word..."Ford". This might explain why I've had issues finding it on the web.
I just found one on the web. It said it's from a 46-48 Ford and they wanted $300 for it. I seriously doubt it is really worth that. It is good condition. I think it could be hooked up and put right to work.