Hi
yes this was made by RCA. I think rca was one of the only ones that made their own stuff that im aware of. But for this Model it was their own. The cabinet came from a RCA sales executives estate. RCA had a custom cabinet division. if you wanted a specific style, danish modern or what have you. they would make it for you. He had other cabinets just like mine some smaller that he used for other things. He had one that was for record storage as well.
Being he worked for RCA he was able to probably pick the phone up and call down stairs and order what he wanted. two big doors in the front open to a nice grill cloth and the inside of each door is cloth behind the louvers. It is very well made and is walnut. very heavy.
I have a brochure that talks about their custom cabinets they had, you had to go to your rca dealer and inquire. This guy being a sales exec there just made a phone call im sure

Also i found the belts Gary at VM had both and they are on the way.