It's a pressboard cabinet with a wooden stick frame inside. I have the identical set in the bedroom.
I saved it from the trash about 3 years ago. It's in pristine shape, but a huge puzzler. The chassis transformer is missing, so I assume that someone wanted it for scrap value, but the job was done so neatly that it makes me guess that it was a parts set that someone had in their basement for a long long time.
I've just been waiting for a chassis to come along
