Mexican blisters 2017-2021

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Thank you!...

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Hello!

I making the completest Cars-database. Both by the models themselves and by the blisters.

But for some reason it is difficult...

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OK. But why 2021 is "P', not "Q", if 2022 is "R"? How to understand which year which letter corresponds to?

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Hello to all!
Who knows how read Mattel production codes on the cars from Thailand factory? In my opinion the letter - is code of the year. But...