I would not trust the 81 in the serial number to be the year, ABI numbers following a serial format and needing the list to know what year a number refers to.
But in this case it's possibly 81 or an 80, if that is, it's on a B&B chassis and body 11ft long?. If Alko chassis, then it's 82 and 11' 9", if earlier than 80 it will be 10' 9" long
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