This Grey Gardens clip illustrates how Fisher was the brand of choice for monied elites on the East Coast.
By the 70s, the Beales had money issues. But they had enough scratch ten years earlier to buy the 500C.
I wonder if the receiver was part of the recent estate sale?
https://www.nytimes.com/2017/11/22/style/grey-gardens-estate-sale.html
Never seen either one.