Armor discrepancy

so i noticed an armor discrepancy with the premium t-34-85 '45

as you can clearly see, these are 2 plates of armor welded together. yet the entire thing is globally put at 10mm of armor.

from the inside you can clearly see it are 2 plates welded together. so its either 5 + 5, or its 10 + 10. i dont know the original values. but something has been overlooked here.

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