Maximum upper frequency limit is determined by the distance from the outer surface of the center conductor to the inner surface of the shield. The larger the cable, the lower the frequency...etc.
In all likelihood, you could use it at the upper frequency limits since Andrews is conservative in the ratings (they're selling to engineers who have accurate measurement equipment at their disposal, after all).
The question is why was it pulled from service (if it was). A sweep would be a good idea since cable, unlike fine wine, does not get better with age. --
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