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Message: <blockquote data-quote="Renze de Vries" data-source="post: 1524155" data-attributes="member: 10024">I think serial numbers are assigned to production runs, batches of different models, so ideally it is important to know the model + the serial number. For instance, if I refer to a 20x60S' serial number in connection with a 15x60 GAT one should be aware this is not really accurate. However, as I take it the bias could be hardly more than one or two years.Renze</blockquote>