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The Mix of tubes in a radio or TV can sometime give a clue as to how long it was used. For the most part all radios and TV's where populated with manufacture branded tubes, there are rare exceptions to this though. As the set gets used the owner starts putting in different brands when old tubes go bad. That is of course unless that did insist on factory branded tubes or lived in a small town and only had one choice. The more motley mix of tubes the longer it was probably used.
I have an RCA 14" portable set I picked up only the Rectifier and CRT where still RCA and of the tubes installed 14 out of 23 tested very weak or had shorts.
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