The Serialization Book and the production figures in TPS were compiled from the stock books. At the time of the publication of TPS, the order books had not been copied or studied. Neither book covers all the bases. Once the order books were studied, much more information was available, but it was too late to include that information in the two books. The authors did use some little information from the order books for compilation of the charts in the appendix, but not for the "Grades" section as far as I am aware.
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