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It looks like a typical thinkpad rubber back, but with the x1's "carbon fiber" design cutting through it with a wide diagonal line. Google only gives standard rubber backs. Anyone have any idea what this version of the design is called?
do you have the specific model number of it? that may lead to a specific hardware revision,
could also have been a replaced part, tho idk
Neofetch says 20BUS13B08 (Thinkpad T450)
Theres a sticker on the bottom which says KO-99924457
Also the keyboard is Swedish QWERTY, it has Æ, Ø and Å.