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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
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