Can any one provide information on a RCA 21 328 BK (or is it 8K) television set? Manufacture date, rareity, value etc?

It's been in the family for decades.

Thanks

Hi, Think you are missing part of the model # Did find a 21D328 It's from 1953. RCA around 1951 stared using a rectangular picture tube. Earlier ones would have a round tube with a mask in front of it making the top and bottom straight across. Your's would be a early rectangular picture tube set. Is it rare? Nah still lots of them around. Worth? All depends on condition. In good condition with out being serviced maybe around $50 or so.
Just one guys opinion.
Terry