All of the Ever After High items manufactured by Mattel itself have one or two numbers on the back of the packaging, usually in the lower right corner. These numbers are the product numbers, which Mattel assigns to its products — whether they are related to Ever After High, Monster High, or something different altogether — so that they can be systemized. In case of two numbers, the first is the assortment number and the second the model number. In case of only one number, it alone is both. All items that have the same assortment number are part of the same assortment.
The reason product numbers are interesting is similar to why trademarks are: they tell something about the franchise's development. By default, an assortment number is followed in order by its model numbers. For instance, the Legacy Day assortment is BCF47 and its first wave's three dolls are assigned BCF48, BCF49, and BCF50. Changes in the assortment number under one series name sometimes indicates a change in availability or price point but just as easily it means nothing at all.
Because the product numbers by default are ordered, irregularities in the order of the product numbers indicate changes of plans up until shortly before production was started.
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